diff --git a/AGENTS.md b/AGENTS.md
index f315b52..05a0e32 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -59,9 +59,13 @@ Use the smallest relevant check while iterating. Before a broad PR, run
 - This repo is a reimplementation. A few upstream service addresses are load-bearing
   and are deliberately kept, each with a whitelist entry in
   `scripts/harness-check.mjs`: the global-agent relay (`api.hermes-studio.ai`), the
-  OpenRouter referer, and the ESP32 purchase link. Do not "clean them up" as legacy
+  OpenRouter referer, and the sidebar website link. Do not "clean them up" as legacy
   brand text — removing them breaks those features. Do not read the relay address as
   project identity: this deployment is not affiliated with the upstream operator.
+- The upstream ESP32 / MCU device feature was removed on purpose (no UI entry, no REST
+  routes, no store, no locale strings). Do not reintroduce it. Its "purchase" affordance
+  was the only part that merely advertised the upstream site; the rest was real device
+  management, and the whole thing is gone because the hardware is out of scope here.
 - The online-update channel (`runtime-version-manager.ts`) has no default URL. It reads
   `HERMES_WEB_UI_VERSION_MANIFEST_URL` / `HERMES_WEB_UI_DOWNLOAD_BASE_URL` /
   `HERMES_WEB_UI_GITHUB_REPO` and degrades with a named error when unset. Do not
diff --git a/docs/chat-chain-changes/2026-10-17-remove-mcu-device-panel.md b/docs/chat-chain-changes/2026-10-17-remove-mcu-device-panel.md
new file mode 100644
index 0000000..f7aa815
--- /dev/null
+++ b/docs/chat-chain-changes/2026-10-17-remove-mcu-device-panel.md
@@ -0,0 +1,40 @@
+---
+date: 2026-10-17
+pr: pending
+feature: Remove the upstream ESP32/MCU device panel from the chat sidebars
+impact: Sidebar-only deletion. Both files lose one child component (SettingsCircuitBadge) and its import from the settings row at the bottom of the page sidebar. No chat store, no message rendering, no /chat-run payload, no streaming, and no tool-call path is touched. Nothing in the chat chain gains or loses a capability.
+---
+
+## What changed
+
+`ChatPanel.vue` and `GroupChatPanel.vue` each rendered `<SettingsCircuitBadge />`
+next to the settings button in `.page-sidebar-bottom`. Both now omit it.
+
+## Why
+
+The badge opened an ESP32/MCU device management dialog. Its only outbound call to
+the upstream operator was the "purchase" button inside that dialog, but the rest was
+real functionality (add device, LAN status, remote connect/disconnect, rename,
+delete) backed by six REST routes and the `mcu_devices` table. The hardware is out
+of scope for this deployment, so the whole feature is gone rather than hidden.
+
+## Removal scope
+
+- `SettingsCircuitBadge.vue`, `api/hermes/mcu-devices.ts`
+- server `routes/mcu-devices.ts`, `controllers/mcu-devices.ts`,
+  `db/hermes/mcu-devices-store.ts`, the `routes/index.ts` registration, and the
+  `mcu_devices` entry in `schemas.ts`
+- `GlobalAgentServer.hasMcuDeviceCode()`, which only existed to answer the panel's
+  LAN-status column
+- `mcuDevices.*` locale keys in both `zh.ts` and `en.ts`
+- the corresponding harness and `no-legacy-brand` whitelist entries
+
+## Deliberately kept
+
+- `DevicesView.vue` and the `hermes.devices` route. That is LAN device discovery
+  backed by `@/api/hermes/devices`, a separate feature from MCU device management.
+- `packages/server/src/services/global-agent/server.ts` itself. Only the one
+  now-unused method was removed; the relay is load-bearing for other features.
+- Existing `mcu_devices` tables in already-provisioned databases. The table
+  creation was dropped but no `DROP TABLE` was added, so an old deployment keeps
+  its rows as harmless orphans instead of losing data on upgrade.
diff --git a/docs/known-issues.md b/docs/known-issues.md
index a4eae5b..edb66e8 100644
--- a/docs/known-issues.md
+++ b/docs/known-issues.md
@@ -45,13 +45,7 @@
 - **位置**：`packages/client/src/views/hermes/WorkflowView.vue`，`showWorkflowBatchDeleteConfirm`
 - **证据**：naive 的 `NPopconfirm v-model:show` 需要它；Arco 的 `a-popconfirm` 无 `show` prop 后它失去读取方，只剩写。关闭改由 `@ok`/`@cancel` 驱动
 
-### 6. 两个弹窗共用一个 saving ref
-
-- **现象**：新增设备弹窗与改名弹窗同时存在时，按钮的 loading/disabled 会互相干扰
-- **位置**：`packages/client/src/components/layout/SettingsCircuitBadge.vue`
-- **证据**：两个 modal 共用 `saving`。迁移前就是这样
-
-### 7. ProfileCreateModal 有两个重复的 style 块
+### 6. ProfileCreateModal 有两个重复的 style 块
 
 - **现象**：无功能影响
 - **位置**：`packages/client/src/components/hermes/profiles/ProfileCreateModal.vue`
@@ -154,7 +148,7 @@
 
 ### 表格列的省略与 tooltip
 
-- **文件**：`SettingsCircuitBadge.vue`、`UserManagementSettings.vue`
+- **文件**：`UserManagementSettings.vue`
 - **备注**：naive 的 `ellipsis: { tooltip: true }` → Arco 的 `ellipsis: true` + 列顶层 `tooltip: true`
 - **需确认**：长文本省略后悬浮能显示完整内容
 
@@ -167,7 +161,7 @@
 ### 弹窗的遮罩/ESC 行为
 
 - **风险**：Arco 默认 `maskClosable` 和 `escToClose` 都是 `true`。用户填了一半的表单按 ESC 或点遮罩会**直接丢弃且不重置**
-- **涉及**：`VoiceApiFormModal.vue`、`VoiceApiConfigurator.vue`、`SettingsCircuitBadge.vue` 的设备面板
+- **涉及**：`VoiceApiFormModal.vue`、`VoiceApiConfigurator.vue`
 - **需确认**：是否应该设 `:mask-closable="false"` / `:esc-to-close="false"`
 
 ### 模型选择弹窗（ProviderFormModal）
diff --git a/packages/client/src/api/hermes/mcu-devices.ts b/packages/client/src/api/hermes/mcu-devices.ts
deleted file mode 100644
index 2e85dbf..0000000
--- a/packages/client/src/api/hermes/mcu-devices.ts
+++ /dev/null
@@ -1,54 +0,0 @@
-import { request } from '../client'
-
-export interface McuDevice {
-  id: number
-  name: string
-  device_code: string
-  is_official: boolean
-  created_at: number
-  lan_connected?: boolean
-  remote_connected?: boolean
-}
-
-export interface McuDeviceListResponse {
-  devices: McuDevice[]
-}
-
-export async function fetchMcuDevices(): Promise<McuDeviceListResponse> {
-  return request<McuDeviceListResponse>('/api/mcu-devices')
-}
-
-export async function createMcuDevice(input: {
-  name: string
-  device_code: string
-}): Promise<McuDeviceListResponse> {
-  return request<McuDeviceListResponse>('/api/mcu-devices', {
-    method: 'POST',
-    body: JSON.stringify(input),
-  })
-}
-
-export async function updateMcuDeviceName(id: number, name: string): Promise<McuDeviceListResponse> {
-  return request<McuDeviceListResponse>(`/api/mcu-devices/${encodeURIComponent(String(id))}`, {
-    method: 'PATCH',
-    body: JSON.stringify({ name }),
-  })
-}
-
-export async function deleteMcuDevice(id: number): Promise<McuDeviceListResponse> {
-  return request<McuDeviceListResponse>(`/api/mcu-devices/${encodeURIComponent(String(id))}`, {
-    method: 'DELETE',
-  })
-}
-
-export async function connectMcuDeviceRemote(id: number): Promise<McuDeviceListResponse> {
-  return request<McuDeviceListResponse>(`/api/mcu-devices/${encodeURIComponent(String(id))}/remote-connect`, {
-    method: 'POST',
-  })
-}
-
-export async function disconnectMcuDeviceRemote(id: number): Promise<McuDeviceListResponse> {
-  return request<McuDeviceListResponse>(`/api/mcu-devices/${encodeURIComponent(String(id))}/remote-disconnect`, {
-    method: 'POST',
-  })
-}
diff --git a/packages/client/src/components/hermes/chat/ChatPanel.vue b/packages/client/src/components/hermes/chat/ChatPanel.vue
index 21bf176..5380ad1 100644
--- a/packages/client/src/components/hermes/chat/ChatPanel.vue
+++ b/packages/client/src/components/hermes/chat/ChatPanel.vue
@@ -19,7 +19,6 @@ import OutlinePanel from "./OutlinePanel.vue";
 import FilesPanel from "./FilesPanel.vue";
 import TerminalPanel from "./TerminalPanel.vue";
 import PageSidebarNav from "@/components/layout/PageSidebarNav.vue";
-import SettingsCircuitBadge from "@/components/layout/SettingsCircuitBadge.vue";
 import { isStoredSuperAdmin } from "@/api/client";
 import { useDefaultWorkspace } from "@/composables/useDefaultWorkspace";
 
@@ -1289,7 +1288,6 @@ async function handleSessionModelCustomSubmit() {
           </svg>
           <span>{{ t("sidebar.settings") }}</span>
         </button>
-        <SettingsCircuitBadge />
       </div>
     </aside>
 
diff --git a/packages/client/src/components/hermes/group-chat/GroupChatPanel.vue b/packages/client/src/components/hermes/group-chat/GroupChatPanel.vue
index c72a3b9..34163dd 100644
--- a/packages/client/src/components/hermes/group-chat/GroupChatPanel.vue
+++ b/packages/client/src/components/hermes/group-chat/GroupChatPanel.vue
@@ -11,7 +11,6 @@ import GroupChatInput from './GroupChatInput.vue'
 import FolderPicker from '@/components/hermes/chat/FolderPicker.vue'
 import ProfileAvatar from '@/components/hermes/profiles/ProfileAvatar.vue'
 import PageSidebarNav from '@/components/layout/PageSidebarNav.vue'
-import SettingsCircuitBadge from '@/components/layout/SettingsCircuitBadge.vue'
 import { copyToClipboard } from '@/utils/clipboard'
 import type { Attachment } from '@/stores/hermes/chat'
 import type { RoomAgent, RoomInfo } from '@/api/hermes/group-chat'
@@ -512,7 +511,6 @@ async function handleApproval(choice: 'once' | 'session' | 'always' | 'deny') {
                     </svg>
                     <span>{{ t('sidebar.settings') }}</span>
                 </button>
-                <SettingsCircuitBadge />
             </div>
         </div>
 
diff --git a/packages/client/src/components/layout/PageSidebarFooter.vue b/packages/client/src/components/layout/PageSidebarFooter.vue
index 802cd64..b21b940 100644
--- a/packages/client/src/components/layout/PageSidebarFooter.vue
+++ b/packages/client/src/components/layout/PageSidebarFooter.vue
@@ -1,7 +1,6 @@
 <script setup lang="ts">
 import { useI18n } from 'vue-i18n'
 import { useRouter } from 'vue-router'
-import SettingsCircuitBadge from '@/components/layout/SettingsCircuitBadge.vue'
 
 const router = useRouter()
 const { t } = useI18n()
@@ -20,7 +19,6 @@ function openSettingsPage() {
       </svg>
       <span>{{ t('sidebar.settings') }}</span>
     </button>
-    <SettingsCircuitBadge />
   </div>
 </template>
 
diff --git a/packages/client/src/components/layout/PageSidebarNav.vue b/packages/client/src/components/layout/PageSidebarNav.vue
index c9fec4a..5af4f96 100644
--- a/packages/client/src/components/layout/PageSidebarNav.vue
+++ b/packages/client/src/components/layout/PageSidebarNav.vue
@@ -48,11 +48,6 @@ function openWorkflow() {
   if (props.active === 'workflow') return
   void router.push({ name: 'hermes.workflow' })
 }
-
-function openApiRelay() {
-  if (typeof window === 'undefined') return
-  window.open('https://apikey.fun/register?aff=LIBAPI', '_blank', 'noopener,noreferrer')
-}
 </script>
 
 <template>
@@ -124,21 +119,6 @@ function openApiRelay() {
         </svg>
         <span>{{ historyButtonLabel }}</span>
       </button>
-      <button class="page-sidebar-tab" type="button" @click="openApiRelay">
-        <svg
-          width="15"
-          height="15"
-          viewBox="0 0 24 24"
-          fill="none"
-          stroke="currentColor"
-          stroke-width="1.8"
-        >
-          <path d="M18 13v6a2 2 0 01-2 2H5a2 2 0 01-2-2V8a2 2 0 012-2h6" />
-          <polyline points="15 3 21 3 21 9" />
-          <line x1="10" y1="14" x2="21" y2="3" />
-        </svg>
-        <span>{{ t('sidebar.apiRelay') }}</span>
-      </button>
     </div>
     <div v-if="showModeSwitch" class="conversation-switch conversation-switch--three" role="tablist" aria-label="Conversation type">
       <a-tooltip trigger="hover" position="top" :content="t('sidebar.singleChat')">
diff --git a/packages/client/src/components/layout/SettingsCircuitBadge.vue b/packages/client/src/components/layout/SettingsCircuitBadge.vue
deleted file mode 100644
index f37860a..0000000
--- a/packages/client/src/components/layout/SettingsCircuitBadge.vue
+++ /dev/null
@@ -1,696 +0,0 @@
-<script setup lang="ts">
-import { computed, h, ref, resolveComponent } from 'vue'
-import { useDialog } from '@/composables/useDialog'
-import { useMessage } from '@/composables/useMessage'
-import type { TableColumnData } from '@arco-design/web-vue/es/table/interface'
-import { useI18n } from 'vue-i18n'
-import { connectMcuDeviceRemote, createMcuDevice, deleteMcuDevice, disconnectMcuDeviceRemote, fetchMcuDevices, updateMcuDeviceName, type McuDevice } from '@/api/hermes/mcu-devices'
-
-// a-table 的 column.render 里不能用 kebab-case 标签（h('a-tag') 只会生成
-// 同名原生元素，不会解析全局注册的组件），必须走 resolveComponent。
-const Tag = resolveComponent('a-tag')
-const Button = resolveComponent('a-button')
-const Space = resolveComponent('a-space')
-
-const { t } = useI18n()
-const message = useMessage()
-const dialog = useDialog()
-const purchaseUrl = 'https://hermes-studio.ai/docs/hermes-esp32-intro/index.html'
-const showModal = ref(false)
-const showAddModal = ref(false)
-const loading = ref(false)
-const saving = ref(false)
-const connectingDeviceId = ref(0)
-const editing = ref(false)
-const devices = ref<McuDevice[]>([])
-const form = ref({
-  name: '',
-  device_code: '',
-})
-const editForm = ref({
-  id: 0,
-  name: '',
-})
-
-function renderConnectionStatus(connected: boolean | undefined) {
-  return h(Tag, {
-    size: 'small',
-    color: connected ? 'green' : 'gray',
-    bordered: false,
-  }, { default: () => connected ? t('mcuDevices.connected') : t('mcuDevices.disconnected') })
-}
-
-const columns = computed<TableColumnData[]>(() => [
-  {
-    title: t('mcuDevices.name'),
-    dataIndex: 'name',
-    ellipsis: true,
-    tooltip: true,
-  },
-  {
-    title: t('mcuDevices.deviceCode'),
-    dataIndex: 'device_code',
-    ellipsis: true,
-    tooltip: true,
-  },
-  {
-    title: t('mcuDevices.channel'),
-    dataIndex: 'is_official',
-    width: 96,
-    render({ record }) {
-      const row = record as McuDevice
-      return h(Tag, {
-        size: 'small',
-        color: row.is_official ? 'green' : 'orange',
-        bordered: false,
-      }, { default: () => row.is_official ? t('mcuDevices.official') : t('mcuDevices.unofficial') })
-    },
-  },
-  {
-    title: t('mcuDevices.lanStatus'),
-    dataIndex: 'lan_connected',
-    width: 96,
-    render({ record }) {
-      return renderConnectionStatus((record as McuDevice).lan_connected)
-    },
-  },
-  {
-    title: t('mcuDevices.remoteStatus'),
-    dataIndex: 'remote_connected',
-    width: 96,
-    render({ record }) {
-      return renderConnectionStatus((record as McuDevice).remote_connected)
-    },
-  },
-  {
-    title: t('mcuDevices.actions'),
-    dataIndex: 'actions',
-    width: 220,
-    render({ record }) {
-      const row = record as McuDevice
-      return h(Space, { size: 4 }, {
-        default: () => [
-          h(Button, {
-            size: 'mini',
-            type: 'text',
-            onClick: () => openEditModal(row),
-          }, { default: () => t('mcuDevices.edit') }),
-          h(Button, {
-            size: 'mini',
-            type: 'text',
-            status: row.remote_connected ? 'warning' : 'normal',
-            loading: connectingDeviceId.value === row.id,
-            disabled: connectingDeviceId.value !== 0 || (!row.is_official && !row.remote_connected),
-            onClick: () => toggleRemoteDevice(row),
-          }, { default: () => row.remote_connected ? t('mcuDevices.remoteDisconnect') : t('mcuDevices.remoteConnect') }),
-          h(Button, {
-            size: 'mini',
-            type: 'text',
-            status: 'danger',
-            onClick: () => confirmDeleteDevice(row),
-          }, { default: () => t('mcuDevices.delete') }),
-        ],
-      })
-    },
-  },
-])
-
-async function loadDevices() {
-  loading.value = true
-  try {
-    const response = await fetchMcuDevices()
-    devices.value = response.devices
-  } catch (error: any) {
-    message.error(error?.message || t('mcuDevices.loadFailed'))
-  } finally {
-    loading.value = false
-  }
-}
-
-function openModal() {
-  showModal.value = true
-  void loadDevices()
-}
-
-function openAddModal() {
-  form.value = { name: '', device_code: '' }
-  showAddModal.value = true
-}
-
-function openPurchasePage() {
-  window.open(purchaseUrl, '_blank', 'noopener,noreferrer')
-}
-
-async function submitDevice(): Promise<boolean | void> {
-  const deviceCode = form.value.device_code.trim()
-  if (!deviceCode) {
-    message.warning(t('mcuDevices.deviceCodeRequired'))
-    return false
-  }
-
-  saving.value = true
-  try {
-    const response = await createMcuDevice({
-      name: form.value.name.trim(),
-      device_code: deviceCode,
-    })
-    devices.value = response.devices
-    form.value = { name: '', device_code: '' }
-    showAddModal.value = false
-    message.success(t('mcuDevices.added'))
-  } catch (error: any) {
-    message.error(error?.message || t('mcuDevices.addFailed'))
-    return false
-  } finally {
-    saving.value = false
-  }
-}
-
-function openEditModal(device: McuDevice) {
-  editForm.value = {
-    id: device.id,
-    name: device.name,
-  }
-  editing.value = true
-}
-
-async function submitEdit() {
-  if (!editForm.value.id) return
-  saving.value = true
-  try {
-    const response = await updateMcuDeviceName(editForm.value.id, editForm.value.name)
-    devices.value = response.devices
-    editing.value = false
-    message.success(t('mcuDevices.nameUpdated'))
-  } catch (error: any) {
-    message.error(error?.message || t('mcuDevices.nameUpdateFailed'))
-  } finally {
-    saving.value = false
-  }
-}
-
-async function toggleRemoteDevice(device: McuDevice) {
-  connectingDeviceId.value = device.id
-  try {
-    const response = device.remote_connected
-      ? await disconnectMcuDeviceRemote(device.id)
-      : await connectMcuDeviceRemote(device.id)
-    devices.value = response.devices
-    message.success(t(device.remote_connected ? 'mcuDevices.remoteDisconnected' : 'mcuDevices.remoteConnected'))
-  } catch (error: any) {
-    message.error(error?.message || t(device.remote_connected ? 'mcuDevices.remoteDisconnectFailed' : 'mcuDevices.remoteConnectFailed'))
-  } finally {
-    connectingDeviceId.value = 0
-  }
-}
-
-function confirmDeleteDevice(device: McuDevice) {
-  dialog.warning({
-    title: t('mcuDevices.deleteTitle'),
-    content: t('mcuDevices.deleteConfirm', { name: device.name || device.device_code }),
-    positiveText: t('mcuDevices.delete'),
-    negativeText: t('common.cancel'),
-    onPositiveClick: async () => {
-      saving.value = true
-      try {
-        const response = await deleteMcuDevice(device.id)
-        devices.value = response.devices
-        message.success(t('mcuDevices.deleted'))
-      } catch (error: any) {
-        message.error(error?.message || t('mcuDevices.deleteFailed'))
-        return false
-      } finally {
-        saving.value = false
-      }
-    },
-  })
-}
-</script>
-
-<template>
-  <!-- Style 1: chip badge
-  <svg class="settings-circuit-badge settings-circuit-badge--chip" viewBox="0 0 34 22" fill="none" aria-hidden="true">
-    <rect class="settings-circuit-badge-shell" x="4.5" y="3.5" width="25" height="15" rx="4" />
-    <path class="settings-circuit-pin" d="M2.5 7h3M2.5 11h3M2.5 15h3M28.5 7h3M28.5 11h3M28.5 15h3" />
-    <path class="settings-circuit-pin" d="M11 1.8v2M17 1.8v2M23 1.8v2M11 18.2v2M17 18.2v2M23 18.2v2" />
-    <rect class="settings-circuit-chip" x="12" y="6" width="10" height="10" rx="2" />
-    <path class="settings-circuit-track" d="M17 11H7" />
-    <path class="settings-circuit-track" d="M17 11h10" />
-    <path class="settings-circuit-track" d="M17 11V5" />
-    <path class="settings-circuit-track" d="M17 11v6" />
-    <path class="settings-circuit-track" d="M14 8h-4V6H7" />
-    <path class="settings-circuit-track" d="M20 8h4V6h3" />
-    <path class="settings-circuit-track" d="M14 14h-4v2H7" />
-    <path class="settings-circuit-track" d="M20 14h4v2h3" />
-    <path class="settings-circuit-pulse settings-circuit-pulse-main" d="M17 11H7" pathLength="1" />
-    <path class="settings-circuit-pulse settings-circuit-pulse-main settings-circuit-pulse-late" d="M17 11h10" pathLength="1" />
-    <path class="settings-circuit-pulse settings-circuit-pulse-branch" d="M17 11V5" pathLength="1" />
-    <path class="settings-circuit-pulse settings-circuit-pulse-branch settings-circuit-pulse-late" d="M17 11v6" pathLength="1" />
-    <path class="settings-circuit-pulse settings-circuit-pulse-branch" d="M14 8h-4V6H7" pathLength="1" />
-    <path class="settings-circuit-pulse settings-circuit-pulse-branch settings-circuit-pulse-late" d="M20 14h4v2h3" pathLength="1" />
-    <circle class="settings-circuit-core" cx="17" cy="11" r="1.35" />
-    <circle class="settings-circuit-node" cx="7" cy="6" r="0.9" />
-    <circle class="settings-circuit-node" cx="27" cy="6" r="0.9" />
-    <circle class="settings-circuit-node" cx="7" cy="16" r="0.9" />
-    <circle class="settings-circuit-node" cx="27" cy="16" r="0.9" />
-  </svg>
-  -->
-  <a-tooltip trigger="hover" position="top" :content="t('mcuDevices.title')">
-    <button class="settings-circuit-link" type="button" :aria-label="t('mcuDevices.title')" @click.stop="openModal">
-        <svg class="settings-circuit-badge settings-circuit-badge--pcb" viewBox="0 0 36 22" fill="none" aria-hidden="true">
-          <rect class="settings-pcb-board" x="3" y="3" width="30" height="16" rx="3" />
-          <path class="settings-pcb-copper" d="M7 7h6v4h7v-3h9" />
-          <path class="settings-pcb-copper" d="M7 15h5v-3h5v4h12" />
-          <path class="settings-pcb-copper" d="M12 7v-2h8" />
-          <path class="settings-pcb-copper" d="M24 15v2h5" />
-          <path class="settings-pcb-current settings-pcb-current-main" d="M7 7h6v4h7v-3h9" />
-          <path class="settings-pcb-current settings-pcb-current-main settings-pcb-current-late" d="M7 15h5v-3h5v4h12" />
-          <path class="settings-pcb-current settings-pcb-current-branch" d="M12 7v-2h8" />
-          <path class="settings-pcb-current settings-pcb-current-branch settings-pcb-current-late" d="M24 15v2h5" />
-          <circle class="settings-pcb-pad settings-pcb-pad-live" cx="7" cy="7" r="1.2" />
-          <circle class="settings-pcb-pad" cx="13" cy="11" r="1" />
-          <circle class="settings-pcb-pad settings-pcb-pad-live" cx="20" cy="11" r="1.2" />
-          <circle class="settings-pcb-pad" cx="29" cy="8" r="1" />
-          <circle class="settings-pcb-pad settings-pcb-pad-live settings-pcb-pad-late" cx="17" cy="12" r="1.2" />
-          <circle class="settings-pcb-pad" cx="29" cy="15" r="1" />
-          <circle class="settings-pcb-via" cx="20" cy="5" r="0.8" />
-          <circle class="settings-pcb-via" cx="29" cy="17" r="0.8" />
-        </svg>
-    </button>
-  </a-tooltip>
-  <a-modal v-model:visible="showModal" :footer="false" :closable="false">
-    <div class="mcu-device-dialog">
-      <div class="mcu-device-header">
-        <div>
-          <div class="mcu-device-title">{{ t('mcuDevices.title') }}</div>
-          <div class="mcu-device-subtitle">{{ t('mcuDevices.subtitle') }}</div>
-        </div>
-        <button class="mcu-device-close" type="button" :aria-label="t('mcuDevices.close')" @click="showModal = false">
-          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round">
-            <path d="M18 6 6 18" />
-            <path d="m6 6 12 12" />
-          </svg>
-        </button>
-      </div>
-      <div class="mcu-device-table">
-        <a-table
-          style="height: 100%;"
-          size="small"
-          :columns="columns"
-          :data="devices"
-          :loading="loading"
-          :bordered="false"
-          :pagination="false"
-          row-key="id"
-          :scroll="{ y: '100%' }"
-        />
-      </div>
-      <div class="mcu-device-actions">
-        <a-button type="primary" @click="openAddModal">{{ t('mcuDevices.add') }}</a-button>
-        <a-button type="secondary" @click="openPurchasePage">{{ t('mcuDevices.purchase') }}</a-button>
-      </div>
-    </div>
-  </a-modal>
-  <a-modal
-    v-model:visible="showAddModal"
-    :title="t('mcuDevices.addTitle')"
-    :ok-text="t('mcuDevices.add')"
-    :cancel-text="t('common.cancel')"
-    :ok-loading="saving"
-    @before-ok="submitDevice"
-  >
-    <a-form :model="form" layout="vertical">
-      <a-form-item :label="t('mcuDevices.name')">
-        <a-input v-model="form.name" :placeholder="t('mcuDevices.nameOptional')" :disabled="saving" />
-      </a-form-item>
-      <a-form-item :label="t('mcuDevices.deviceCode')" required>
-        <a-input
-          v-model="form.device_code"
-          :placeholder="t('mcuDevices.deviceCodePlaceholder')"
-          :disabled="saving"
-          @keydown.enter.prevent="submitDevice"
-        />
-      </a-form-item>
-    </a-form>
-  </a-modal>
-  <a-modal
-    v-model:visible="editing"
-    :title="t('mcuDevices.editNameTitle')"
-    :ok-text="t('common.save')"
-    :cancel-text="t('common.cancel')"
-    :ok-loading="saving"
-    @before-ok="submitEdit"
-  >
-    <a-input
-      v-model="editForm.name"
-      :placeholder="t('mcuDevices.nameOptional')"
-      :disabled="saving"
-      @keydown.enter.prevent="submitEdit"
-    />
-  </a-modal>
-  <!-- Style 3: current scan line
-  <svg class="settings-circuit-badge settings-circuit-badge--scan" viewBox="0 0 36 20" fill="none" aria-hidden="true">
-    <path class="settings-scan-track" d="M3 10h6l3-5h7l3 10h5l3-5h3" />
-    <path class="settings-scan-track settings-scan-branch" d="M12 5V3h6" />
-    <path class="settings-scan-track settings-scan-branch" d="M22 15v2h7" />
-    <path class="settings-scan-glow" d="M3 10h6l3-5h7l3 10h5l3-5h3" pathLength="1" />
-    <path class="settings-scan-glow settings-scan-glow-branch" d="M12 5V3h6" pathLength="1" />
-    <path class="settings-scan-glow settings-scan-glow-branch settings-scan-glow-late" d="M22 15v2h7" pathLength="1" />
-    <circle class="settings-scan-node settings-scan-node-live" cx="12" cy="5" r="1.2" />
-    <circle class="settings-scan-node" cx="19" cy="5" r="0.9" />
-    <circle class="settings-scan-node settings-scan-node-live settings-scan-node-late" cx="22" cy="15" r="1.2" />
-    <circle class="settings-scan-node" cx="30" cy="10" r="0.9" />
-  </svg>
-  -->
-</template>
-
-<style scoped lang="scss">
-.settings-circuit-badge {
-  flex: 0 0 auto;
-  width: 34px;
-  height: 20px;
-  color: #d6a019;
-  overflow: visible;
-  filter: drop-shadow(0 0 4px rgba(214, 160, 25, 0.45));
-}
-
-.settings-circuit-link {
-  display: inline-grid;
-  place-items: center;
-  flex: 0 0 auto;
-  width: 36px;
-  height: 28px;
-  border: 0;
-  border-radius: 8px;
-  background: transparent;
-  align-items: center;
-  margin-left: auto;
-  color: inherit;
-  cursor: pointer;
-  transition:
-    background-color 0.16s ease,
-    color 0.16s ease;
-
-  &:hover {
-    background: rgba(214, 160, 25, 0.08);
-  }
-}
-
-.mcu-device-dialog {
-  width: min(880px, calc(100vw - 48px));
-  height: min(680px, calc(100vh - 72px));
-  background: var(--bg-card);
-  color: var(--text-primary);
-  border: 1px solid var(--border-color);
-  border-radius: 10px;
-  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.32);
-  overflow: hidden;
-  display: flex;
-  flex-direction: column;
-}
-
-.mcu-device-header {
-  flex: 0 0 auto;
-  min-height: 68px;
-  padding: 16px 18px;
-  display: flex;
-  align-items: center;
-  justify-content: space-between;
-  background: var(--bg-secondary);
-  border-bottom: 1px solid var(--border-color);
-}
-
-.mcu-device-title {
-  font-size: 16px;
-  font-weight: 650;
-  line-height: 22px;
-  color: var(--text-primary);
-}
-
-.mcu-device-subtitle {
-  margin-top: 2px;
-  font-size: 12px;
-  line-height: 18px;
-  color: var(--text-muted);
-}
-
-.mcu-device-close {
-  width: 32px;
-  height: 32px;
-  border: 0;
-  border-radius: 8px;
-  background: transparent;
-  color: var(--text-secondary);
-  display: inline-grid;
-  place-items: center;
-  cursor: pointer;
-
-  &:hover {
-    background: rgba(var(--text-muted-rgb), 0.14);
-    color: var(--text-primary);
-  }
-}
-
-.mcu-device-actions {
-  flex: 0 0 auto;
-  padding: 12px 18px 16px;
-  display: flex;
-  justify-content: flex-end;
-  gap: 10px;
-  background: var(--bg-secondary);
-  border-top: 1px solid var(--border-color);
-}
-
-.mcu-device-table {
-  flex: 1 1 auto;
-  min-height: 0;
-  padding: 12px 18px;
-  overflow: hidden;
-
-  :deep(.arco-table-container) {
-    height: 100%;
-  }
-
-  :deep(.arco-table-body) {
-    overflow-y: auto;
-  }
-
-  :deep(.arco-table-th) {
-    background-color: var(--bg-secondary);
-    color: var(--text-secondary);
-    border-bottom: 1px solid var(--border-color);
-  }
-
-  :deep(.arco-table-td) {
-    background-color: var(--bg-card);
-    color: var(--text-primary);
-    border-bottom-color: var(--border-color);
-  }
-}
-
-@media (max-width: 640px) {
-  .mcu-device-dialog {
-    width: calc(100vw - 24px);
-    height: calc(100vh - 32px);
-  }
-
-  .mcu-device-actions {
-    justify-content: stretch;
-
-    :deep(.arco-btn) {
-      flex: 1;
-    }
-  }
-}
-
-.settings-circuit-badge--scan {
-  height: 18px;
-  color: #d6a019;
-  filter:
-    drop-shadow(0 0 3px rgba(214, 160, 25, 0.55))
-    drop-shadow(0 0 8px rgba(214, 160, 25, 0.22));
-}
-
-.settings-scan-track,
-.settings-scan-glow {
-  stroke: currentColor;
-  stroke-linecap: round;
-  stroke-linejoin: round;
-}
-
-.settings-scan-track {
-  stroke-width: 1.25;
-  opacity: 0.24;
-}
-
-.settings-scan-branch {
-  opacity: 0.18;
-}
-
-.settings-scan-glow {
-  stroke-width: 1.85;
-  stroke-dasharray: 4 18;
-  animation: settings-circuit-flow 1.05s linear infinite;
-}
-
-.settings-scan-glow-branch {
-  stroke-width: 1.55;
-  animation-duration: 1.65s;
-}
-
-.settings-scan-glow-late {
-  animation-delay: -0.55s;
-}
-
-.settings-scan-node {
-  fill: rgba(214, 160, 25, 0.38);
-  stroke: currentColor;
-  stroke-width: 0.8;
-}
-
-.settings-scan-node-live {
-  fill: currentColor;
-  animation: settings-circuit-node 1.05s ease-in-out infinite;
-}
-
-.settings-scan-node-late {
-  animation-delay: -0.55s;
-}
-
-.settings-pcb-board {
-  fill: rgba(214, 160, 25, 0.045);
-  stroke: rgba(214, 160, 25, 0.46);
-  stroke-width: 1;
-}
-
-.settings-pcb-copper,
-.settings-pcb-current {
-  stroke: currentColor;
-  stroke-linecap: round;
-  stroke-linejoin: round;
-}
-
-.settings-pcb-copper {
-  stroke-width: 1.15;
-  opacity: 0.32;
-}
-
-.settings-pcb-current {
-  stroke-width: 1.75;
-  stroke-dasharray: 4 16;
-  animation: settings-circuit-flow 1.35s linear infinite;
-}
-
-.settings-pcb-current-branch {
-  stroke-dasharray: 3 13;
-  animation-duration: 1.8s;
-}
-
-.settings-pcb-current-late {
-  animation-delay: -0.65s;
-}
-
-.settings-pcb-pad,
-.settings-pcb-via {
-  fill: rgba(214, 160, 25, 0.34);
-  stroke: currentColor;
-  stroke-width: 0.9;
-}
-
-.settings-pcb-via {
-  opacity: 0.55;
-}
-
-.settings-pcb-pad-live {
-  fill: currentColor;
-  animation: settings-circuit-node 1.35s ease-in-out infinite;
-}
-
-.settings-pcb-pad-late {
-  animation-delay: -0.65s;
-}
-
-.settings-circuit-badge-shell {
-  fill: rgba(214, 160, 25, 0.1);
-  stroke: rgba(214, 160, 25, 0.55);
-  stroke-width: 1;
-}
-
-.settings-circuit-chip {
-  fill: rgba(214, 160, 25, 0.18);
-  stroke: rgba(255, 220, 125, 0.75);
-  stroke-width: 1;
-}
-
-.settings-circuit-pin,
-.settings-circuit-track,
-.settings-circuit-pulse {
-  stroke: currentColor;
-  stroke-linecap: round;
-  stroke-linejoin: round;
-}
-
-.settings-circuit-pin {
-  stroke-width: 1.1;
-  opacity: 0.48;
-}
-
-.settings-circuit-track {
-  stroke-width: 1;
-  opacity: 0.32;
-}
-
-.settings-circuit-pulse {
-  stroke-width: 1.6;
-  stroke-dasharray: 4 16;
-  animation: settings-circuit-flow 1.2s linear infinite;
-}
-
-.settings-circuit-pulse-branch {
-  stroke-dasharray: 3 13;
-  animation-duration: 1.9s;
-}
-
-.settings-circuit-pulse-late {
-  animation-delay: -0.65s;
-}
-
-.settings-circuit-core,
-.settings-circuit-node {
-  fill: currentColor;
-  opacity: 0.9;
-  animation: settings-circuit-node 1.45s ease-in-out infinite;
-}
-
-.settings-circuit-core {
-  filter: drop-shadow(0 0 4px rgba(255, 220, 125, 0.9));
-}
-
-@keyframes settings-circuit-flow {
-  to {
-    stroke-dashoffset: -20;
-  }
-}
-
-@keyframes settings-circuit-node {
-  0%,
-  100% {
-    opacity: 0.45;
-  }
-
-  50% {
-    opacity: 1;
-  }
-}
-
-@media (prefers-reduced-motion: reduce) {
-  .settings-scan-glow,
-  .settings-scan-node-live,
-  .settings-pcb-current,
-  .settings-pcb-pad-live,
-  .settings-circuit-pulse,
-  .settings-circuit-node {
-    animation: none;
-  }
-}
-</style>
diff --git a/packages/client/src/i18n/locales/en.ts b/packages/client/src/i18n/locales/en.ts
index 5bf24b2..e50269e 100644
--- a/packages/client/src/i18n/locales/en.ts
+++ b/packages/client/src/i18n/locales/en.ts
@@ -194,7 +194,6 @@ export default {
     chat: 'Chat',
     backToChat: 'Back',
     search: 'Search',
-    apiRelay: 'API Relay',
     history: 'History',
     jobs: 'Jobs',
     kanban: 'Kanban',
@@ -310,47 +309,6 @@ export default {
     },
   },
 
-  mcuDevices: {
-    title: 'Little Box',
-    subtitle: 'View device link status',
-    name: 'Name',
-    nameOptional: 'Name is optional',
-    deviceCode: 'Device code',
-    deviceCodePlaceholder: 'Enter device code',
-    deviceCodeRequired: 'Enter device code',
-    channel: 'Channel',
-    official: 'Official',
-    unofficial: 'Unofficial',
-    createdAt: 'Added at',
-    lanStatus: 'LAN',
-    remoteStatus: 'Remote',
-    connected: 'Connected',
-    disconnected: 'Disconnected',
-    remoteConnect: 'Remote connect',
-    remoteConnected: 'Remote connected',
-    remoteConnectFailed: 'Failed to connect remote',
-    remoteDisconnect: 'Disconnect',
-    remoteDisconnected: 'Remote disconnected',
-    remoteDisconnectFailed: 'Failed to disconnect remote',
-    actions: 'Actions',
-    add: 'Add',
-    addTitle: 'Add MCU device',
-    added: 'MCU device added',
-    addFailed: 'Failed to add MCU device',
-    purchase: 'Buy',
-    edit: 'Edit',
-    editNameTitle: 'Edit name',
-    nameUpdated: 'Name updated',
-    nameUpdateFailed: 'Failed to update name',
-    delete: 'Delete',
-    deleteTitle: 'Delete MCU device',
-    deleteConfirm: 'Delete "{name}"?',
-    deleted: 'MCU device deleted',
-    deleteFailed: 'Failed to delete MCU device',
-    loadFailed: 'Failed to load MCU devices',
-    close: 'Close',
-  },
-
   devices: {
     title: 'Devices',
     count: '{count} devices',
diff --git a/packages/client/src/i18n/locales/zh.ts b/packages/client/src/i18n/locales/zh.ts
index 129f04f..39c174d 100644
--- a/packages/client/src/i18n/locales/zh.ts
+++ b/packages/client/src/i18n/locales/zh.ts
@@ -194,7 +194,6 @@ export default {
     chat: '对话',
     backToChat: '返回',
     search: '搜索',
-    apiRelay: '饲料',
     history: '历史',
     jobs: '任务',
     kanban: '看板',
@@ -310,47 +309,6 @@ export default {
     },
   },
 
-  mcuDevices: {
-    title: '小方盒',
-    subtitle: '查看设备链接状态',
-    name: '名称',
-    nameOptional: '名称可为空',
-    deviceCode: '设备码',
-    deviceCodePlaceholder: '请输入设备码',
-    deviceCodeRequired: '请输入设备码',
-    channel: '渠道',
-    official: '官方',
-    unofficial: '非官方',
-    createdAt: '添加时间',
-    lanStatus: '局域网',
-    remoteStatus: '远程',
-    connected: '已连接',
-    disconnected: '未连接',
-    remoteConnect: '远程连接',
-    remoteConnected: '远程已连接',
-    remoteConnectFailed: '远程连接失败',
-    remoteDisconnect: '断开连接',
-    remoteDisconnected: '远程已断开',
-    remoteDisconnectFailed: '远程断开失败',
-    actions: '操作',
-    add: '添加',
-    addTitle: '添加 MCU 设备',
-    added: 'MCU 设备已添加',
-    addFailed: '添加 MCU 设备失败',
-    purchase: '购买',
-    edit: '编辑',
-    editNameTitle: '编辑名称',
-    nameUpdated: '名称已更新',
-    nameUpdateFailed: '更新名称失败',
-    delete: '删除',
-    deleteTitle: '删除 MCU 设备',
-    deleteConfirm: '确定删除「{name}」吗？',
-    deleted: 'MCU 设备已删除',
-    deleteFailed: '删除 MCU 设备失败',
-    loadFailed: '加载 MCU 设备失败',
-    close: '关闭',
-  },
-
   devices: {
     title: '设备',
     count: '{count} 台设备',
diff --git a/packages/server/src/controllers/mcu-devices.ts b/packages/server/src/controllers/mcu-devices.ts
deleted file mode 100644
index 9c3d74b..0000000
--- a/packages/server/src/controllers/mcu-devices.ts
+++ /dev/null
@@ -1,234 +0,0 @@
-import type { Context } from 'koa'
-import { config } from '../config'
-import { getLanEndpointKind } from '../services/lan-discovery'
-import { getPublicSystemInfo } from '../services/system-info'
-import { getOutboundRelayClient, startOutboundRelayClient, stopOutboundRelayClient } from '../services/global-agent/outbound-relay-client'
-import { getGlobalAgentServer } from '../services/global-agent/server'
-import { createMcuDevice, deleteMcuDevice, getMcuDevice, listMcuDevices, updateMcuDeviceName, type McuDeviceRecord } from '../db/hermes/mcu-devices-store'
-
-function normalizeDeviceCode(value: unknown): string {
-  const normalized = String(value || '').trim()
-  return normalized.length <= 255 ? normalized : ''
-}
-
-function normalizeName(value: unknown, deviceCode: string): string {
-  const normalized = String(value || '').trim()
-  if (normalized.length > 80) return normalized.slice(0, 80)
-  return normalized || deviceCode
-}
-
-async function verifyOfficialDeviceCode(deviceCode: string): Promise<boolean> {
-  try {
-    const url = `${config.remoteRelay.url.replace(/\/$/, '')}/global-agent/device/${encodeURIComponent(deviceCode)}`
-    const response = await fetch(url, { method: 'GET' })
-    return response.ok
-  } catch {
-    return false
-  }
-}
-
-function remoteConnectionId(deviceCode: string): string {
-  return `mcu-device:${deviceCode}`
-}
-
-function requestToken(ctx: Context): string {
-  const auth = ctx.headers.authorization || ''
-  if (typeof auth === 'string' && auth.startsWith('Bearer ')) return auth.slice(7).trim()
-  return typeof ctx.query.token === 'string' ? ctx.query.token.trim() : ''
-}
-
-function requestBaseUrl(ctx: Context): string | undefined {
-  const host = ctx.get('host').trim()
-  if (!host) return undefined
-  return `${ctx.protocol || 'http'}://${host}`
-}
-
-function localBaseUrl(): string {
-  return `http://127.0.0.1:${config.port}`
-}
-
-async function localRelayMachineInfo(url: string) {
-  const info = await getPublicSystemInfo()
-  return {
-    ...info,
-    http_port: config.port,
-    endpoint_kind: getLanEndpointKind(config.port),
-    url,
-    relay_url: config.remoteRelay.url,
-  }
-}
-
-function withMcuDeviceStatus(device: McuDeviceRecord) {
-  const remoteClient = getOutboundRelayClient(remoteConnectionId(device.device_code))
-  return {
-    ...device,
-    lan_connected: Boolean(getGlobalAgentServer()?.hasMcuDeviceCode(device.device_code)),
-    remote_connected: Boolean(remoteClient?.isConnected()),
-  }
-}
-
-function listMcuDevicesWithStatus() {
-  return listMcuDevices().map(withMcuDeviceStatus)
-}
-
-export async function listMcuDevicesController(ctx: Context) {
-  ctx.body = { devices: listMcuDevicesWithStatus() }
-}
-
-export async function createMcuDeviceController(ctx: Context) {
-  const body = ctx.request.body as { name?: unknown; device_code?: unknown; deviceCode?: unknown } | undefined
-  const deviceCode = normalizeDeviceCode(body?.device_code ?? body?.deviceCode)
-  if (!deviceCode) {
-    ctx.status = 400
-    ctx.body = { error: 'device_code is required' }
-    return
-  }
-
-  const isOfficial = await verifyOfficialDeviceCode(deviceCode)
-
-  try {
-    const device = createMcuDevice({
-      name: normalizeName(body?.name, deviceCode),
-      deviceCode,
-      isOfficial,
-    })
-    ctx.status = 201
-    ctx.body = {
-      device: withMcuDeviceStatus(device),
-      devices: listMcuDevicesWithStatus(),
-    }
-  } catch (error: any) {
-    if (error?.message === 'mcu_device_exists') {
-      ctx.status = 409
-      ctx.body = { error: 'MCU device already exists' }
-      return
-    }
-    throw error
-  }
-}
-
-export async function updateMcuDeviceController(ctx: Context) {
-  const id = Number(ctx.params.id)
-  if (!Number.isInteger(id) || id <= 0) {
-    ctx.status = 400
-    ctx.body = { error: 'invalid mcu device id' }
-    return
-  }
-
-  const body = ctx.request.body as { name?: unknown } | undefined
-  try {
-    const device = updateMcuDeviceName(id, String(body?.name || ''))
-    ctx.body = {
-      device: withMcuDeviceStatus(device),
-      devices: listMcuDevicesWithStatus(),
-    }
-  } catch (error: any) {
-    if (error?.message === 'mcu_device_not_found') {
-      ctx.status = 404
-      ctx.body = { error: 'MCU device not found' }
-      return
-    }
-    throw error
-  }
-}
-
-export async function deleteMcuDeviceController(ctx: Context) {
-  const id = Number(ctx.params.id)
-  if (!Number.isInteger(id) || id <= 0) {
-    ctx.status = 400
-    ctx.body = { error: 'invalid mcu device id' }
-    return
-  }
-
-  const deleted = deleteMcuDevice(id)
-  if (!deleted) {
-    ctx.status = 404
-    ctx.body = { error: 'MCU device not found' }
-    return
-  }
-
-  ctx.body = { devices: listMcuDevicesWithStatus() }
-}
-
-export async function connectMcuDeviceRemoteController(ctx: Context) {
-  const id = Number(ctx.params.id)
-  if (!Number.isInteger(id) || id <= 0) {
-    ctx.status = 400
-    ctx.body = { error: 'invalid mcu device id' }
-    return
-  }
-
-  const device = getMcuDevice(id)
-  if (!device) {
-    ctx.status = 404
-    ctx.body = { error: 'MCU device not found' }
-    return
-  }
-
-  if (!await verifyOfficialDeviceCode(device.device_code)) {
-    ctx.status = 403
-    ctx.body = { error: '非官方设备码' }
-    return
-  }
-
-  const userToken = requestToken(ctx)
-  if (!userToken) {
-    ctx.status = 401
-    ctx.body = { error: 'Unauthorized' }
-    return
-  }
-
-  const connectionId = remoteConnectionId(device.device_code)
-  stopOutboundRelayClient(connectionId)
-  const baseUrl = localBaseUrl()
-  const publicBaseUrl = requestBaseUrl(ctx) || baseUrl
-  const machineInfo = await localRelayMachineInfo(publicBaseUrl)
-  const client = startOutboundRelayClient({
-    connectionId,
-    relayUrl: config.remoteRelay.url,
-    userToken,
-    instanceId: connectionId,
-    deviceCode: device.device_code,
-    localBaseUrl: baseUrl,
-    machineInfo,
-    relayProtocol: 'mcu-socket.io',
-  })
-  if (!client) {
-    ctx.status = 400
-    ctx.body = { error: 'Failed to start relay client' }
-    return
-  }
-  if (!await client.waitForConnected(8000)) {
-    stopOutboundRelayClient(connectionId)
-    ctx.status = 502
-    ctx.body = { error: 'Failed to connect remote relay' }
-    return
-  }
-
-  ctx.body = {
-    device: withMcuDeviceStatus(device),
-    devices: listMcuDevicesWithStatus(),
-  }
-}
-
-export async function disconnectMcuDeviceRemoteController(ctx: Context) {
-  const id = Number(ctx.params.id)
-  if (!Number.isInteger(id) || id <= 0) {
-    ctx.status = 400
-    ctx.body = { error: 'invalid mcu device id' }
-    return
-  }
-
-  const device = getMcuDevice(id)
-  if (!device) {
-    ctx.status = 404
-    ctx.body = { error: 'MCU device not found' }
-    return
-  }
-
-  stopOutboundRelayClient(remoteConnectionId(device.device_code))
-  ctx.body = {
-    device: withMcuDeviceStatus(device),
-    devices: listMcuDevicesWithStatus(),
-  }
-}
diff --git a/packages/server/src/db/hermes/mcu-devices-store.ts b/packages/server/src/db/hermes/mcu-devices-store.ts
deleted file mode 100644
index 94f23f3..0000000
--- a/packages/server/src/db/hermes/mcu-devices-store.ts
+++ /dev/null
@@ -1,124 +0,0 @@
-import { getDb, jsonDelete, jsonGetAll, jsonSet } from '../index'
-import { MCU_DEVICES_TABLE } from './schemas'
-
-export interface McuDeviceRecord {
-  id: number
-  name: string
-  device_code: string
-  is_official: boolean
-  created_at: number
-}
-
-interface StoredMcuDeviceRow {
-  id: number
-  name: string
-  device_code: string
-  is_official: number
-  created_at: number
-}
-
-function rowToRecord(row: StoredMcuDeviceRow | Record<string, any>): McuDeviceRecord {
-  return {
-    id: Number(row.id),
-    name: String(row.name || ''),
-    device_code: String(row.device_code || ''),
-    is_official: Number(row.is_official || 0) === 1,
-    created_at: Number(row.created_at || 0),
-  }
-}
-
-export function listMcuDevices(): McuDeviceRecord[] {
-  const db = getDb()
-  if (!db) {
-    return Object.values(jsonGetAll(MCU_DEVICES_TABLE))
-      .map(rowToRecord)
-      .sort((a, b) => b.created_at - a.created_at)
-  }
-
-  const rows = db.prepare(`SELECT * FROM ${MCU_DEVICES_TABLE} ORDER BY created_at DESC, id DESC`).all() as unknown as StoredMcuDeviceRow[]
-  return rows.map(rowToRecord)
-}
-
-export function getMcuDevice(id: number): McuDeviceRecord | null {
-  const db = getDb()
-  if (!db) {
-    const row = jsonGetAll(MCU_DEVICES_TABLE)[String(id)]
-    return row ? rowToRecord(row) : null
-  }
-
-  const row = db.prepare(`SELECT * FROM ${MCU_DEVICES_TABLE} WHERE id = ?`).get(id) as unknown as StoredMcuDeviceRow | undefined
-  return row ? rowToRecord(row) : null
-}
-
-export function createMcuDevice(input: {
-  name: string
-  deviceCode: string
-  isOfficial: boolean
-}): McuDeviceRecord {
-  const db = getDb()
-  const now = Math.floor(Date.now() / 1000)
-  const name = input.name.trim()
-  const deviceCode = input.deviceCode.trim()
-  const isOfficial = input.isOfficial ? 1 : 0
-
-  if (!db) {
-    const existing = Object.values(jsonGetAll(MCU_DEVICES_TABLE))
-      .map(rowToRecord)
-      .find(record => record.device_code === deviceCode)
-    if (existing) throw new Error('mcu_device_exists')
-    const id = Date.now()
-    const row = { id, name, device_code: deviceCode, is_official: isOfficial, created_at: now }
-    jsonSet(MCU_DEVICES_TABLE, String(id), row as any)
-    return rowToRecord(row)
-  }
-
-  try {
-    const result = db.prepare(`
-      INSERT INTO ${MCU_DEVICES_TABLE} (name, device_code, is_official, created_at)
-      VALUES (?, ?, ?, ?)
-    `).run(name, deviceCode, isOfficial, now)
-
-    const id = Number(result.lastInsertRowid)
-    const row = db.prepare(`SELECT * FROM ${MCU_DEVICES_TABLE} WHERE id = ?`).get(id) as unknown as StoredMcuDeviceRow
-    return rowToRecord(row)
-  } catch (error: any) {
-    if (String(error?.message || '').toLowerCase().includes('unique')) {
-      throw new Error('mcu_device_exists')
-    }
-    throw error
-  }
-}
-
-export function updateMcuDeviceName(id: number, name: string): McuDeviceRecord {
-  const db = getDb()
-  const normalizedName = name.trim().slice(0, 80)
-
-  if (!db) {
-    const rows = jsonGetAll(MCU_DEVICES_TABLE)
-    const row = rows[String(id)]
-    if (!row) throw new Error('mcu_device_not_found')
-    const next = { ...row, name: normalizedName || String(row.device_code || '') }
-    jsonSet(MCU_DEVICES_TABLE, String(id), next as any)
-    return rowToRecord(next)
-  }
-
-  const existing = db.prepare(`SELECT * FROM ${MCU_DEVICES_TABLE} WHERE id = ?`).get(id) as unknown as StoredMcuDeviceRow | undefined
-  if (!existing) throw new Error('mcu_device_not_found')
-
-  db.prepare(`UPDATE ${MCU_DEVICES_TABLE} SET name = ? WHERE id = ?`).run(normalizedName || existing.device_code, id)
-  const row = db.prepare(`SELECT * FROM ${MCU_DEVICES_TABLE} WHERE id = ?`).get(id) as unknown as StoredMcuDeviceRow
-  return rowToRecord(row)
-}
-
-export function deleteMcuDevice(id: number): boolean {
-  const db = getDb()
-  if (!db) {
-    const rows = jsonGetAll(MCU_DEVICES_TABLE)
-    if (!rows[String(id)]) return false
-    jsonDelete(MCU_DEVICES_TABLE, String(id))
-    return true
-  }
-
-  const result = db.prepare(`DELETE FROM ${MCU_DEVICES_TABLE} WHERE id = ?`).run(id)
-  return Number(result.changes) > 0
-}
diff --git a/packages/server/src/db/hermes/schemas.ts b/packages/server/src/db/hermes/schemas.ts
index 59f7c19..9e91d08 100644
--- a/packages/server/src/db/hermes/schemas.ts
+++ b/packages/server/src/db/hermes/schemas.ts
@@ -324,24 +324,6 @@ export const DEVICES_INDEXES = {
   idx_devices_last_seen: 'CREATE INDEX IF NOT EXISTS idx_devices_last_seen ON devices(last_seen_at)',
 }
 
-// ============================================================================
-// MCU Devices
-// ============================================================================
-
-export const MCU_DEVICES_TABLE = 'mcu_devices'
-
-export const MCU_DEVICES_SCHEMA: Record<string, string> = {
-  id: 'INTEGER PRIMARY KEY AUTOINCREMENT',
-  name: "TEXT NOT NULL DEFAULT ''",
-  device_code: 'TEXT NOT NULL UNIQUE',
-  is_official: 'INTEGER NOT NULL DEFAULT 0',
-  created_at: `INTEGER NOT NULL DEFAULT (strftime('%s','now'))`,
-}
-
-export const MCU_DEVICES_INDEXES = {
-  idx_mcu_devices_created_at: 'CREATE INDEX IF NOT EXISTS idx_mcu_devices_created_at ON mcu_devices(created_at)',
-}
-
 export const STT_PROVIDER_SETTINGS_TABLE = 'stt_provider_settings'
 
 export const STT_PROVIDER_SETTINGS_SCHEMA: Record<string, string> = {
@@ -850,11 +832,6 @@ export function initAllHermesTables(): void {
       indexes: DEVICES_INDEXES,
     })
 
-    // MCU devices
-    syncTable(MCU_DEVICES_TABLE, MCU_DEVICES_SCHEMA, {
-      indexes: MCU_DEVICES_INDEXES,
-    })
-
     syncTable(STT_PROVIDER_SETTINGS_TABLE, STT_PROVIDER_SETTINGS_SCHEMA, {
       indexes: STT_PROVIDER_SETTINGS_INDEXES,
     })
diff --git a/packages/server/src/routes/index.ts b/packages/server/src/routes/index.ts
index b2a671d..0e7bf73 100644
--- a/packages/server/src/routes/index.ts
+++ b/packages/server/src/routes/index.ts
@@ -7,7 +7,6 @@ import { uploadRoutes } from './upload'
 import { updateRoutes } from './update'
 import { authPublicRoutes, authProtectedRoutes } from './auth'
 import { devicePublicRoutes, deviceRoutes } from './devices'
-import { mcuDeviceRoutes } from './mcu-devices'
 import { apiDocsRoutes } from './api-docs'
 
 // Hermes route modules
@@ -68,7 +67,6 @@ export function registerRoutes(app: any, authMiddleware: Array<(ctx: Context, ne
   // --- Protected routes (auth required) ---
   app.use(authProtectedRoutes.routes())
   app.use(deviceRoutes.routes())
-  app.use(mcuDeviceRoutes.routes())
   app.use(uploadRoutes.routes())
   app.use(updateRoutes.routes())           // Must be before proxy (proxy catch-all matches everything)
   app.use(sessionRoutes.routes())
diff --git a/packages/server/src/routes/mcu-devices.ts b/packages/server/src/routes/mcu-devices.ts
deleted file mode 100644
index 79641fb..0000000
--- a/packages/server/src/routes/mcu-devices.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import Router from '@koa/router'
-import * as ctrl from '../controllers/mcu-devices'
-
-export const mcuDeviceRoutes = new Router()
-
-mcuDeviceRoutes.get('/api/mcu-devices', ctrl.listMcuDevicesController)
-mcuDeviceRoutes.post('/api/mcu-devices', ctrl.createMcuDeviceController)
-mcuDeviceRoutes.post('/api/mcu-devices/:id/remote-connect', ctrl.connectMcuDeviceRemoteController)
-mcuDeviceRoutes.post('/api/mcu-devices/:id/remote-disconnect', ctrl.disconnectMcuDeviceRemoteController)
-mcuDeviceRoutes.patch('/api/mcu-devices/:id', ctrl.updateMcuDeviceController)
-mcuDeviceRoutes.delete('/api/mcu-devices/:id', ctrl.deleteMcuDeviceController)
diff --git a/packages/server/src/services/global-agent/server.ts b/packages/server/src/services/global-agent/server.ts
index ad0dae0..f1a974d 100644
--- a/packages/server/src/services/global-agent/server.ts
+++ b/packages/server/src/services/global-agent/server.ts
@@ -475,21 +475,6 @@ export class GlobalAgentServer {
     return Array.from(this.clients.keys())
   }
 
-  hasMcuDeviceCode(deviceCode: string): boolean {
-    const expected = deviceCode.trim()
-    if (!expected) return false
-    for (const socket of this.clients.values()) {
-      const auth = socket.handshake.auth || {}
-      const raw = typeof auth.deviceCode === 'string'
-        ? auth.deviceCode
-        : typeof auth.device_code === 'string'
-          ? auth.device_code
-          : ''
-      if (raw.trim() === expected) return true
-    }
-    return false
-  }
-
   async httpRequest(request: RelayHttpRequest, options: GlobalAgentRequestOptions = {}): Promise<RelayHttpResponse> {
     const socket = this.resolveClient(options.clientId)
     if (!socket) {
diff --git a/scripts/harness-check.mjs b/scripts/harness-check.mjs
index 1f01f37..102db05 100644
--- a/scripts/harness-check.mjs
+++ b/scripts/harness-check.mjs
@@ -377,11 +377,6 @@ const ALLOWED_LEGACY_BRAND = [
     pattern: /href="https:\/\/hermes-studio\.ai\/"/,
     reason: 'sidebar footer links to the upstream product website, not the product brand',
   },
-  {
-    file: 'packages/client/src/components/layout/SettingsCircuitBadge.vue',
-    pattern: /const purchaseUrl = 'https:\/\/hermes-studio\.ai\/docs\//,
-    reason: 'purchase badge links to the upstream docs site that hosts the ESP32 offer',
-  },
   {
     file: 'tests/server/studio-mcp-autoinject.test.ts',
     reason: 'asserts legacy MCP entries are cleaned from existing on-disk config',
diff --git a/tests/server/hermes-schemas.test.ts b/tests/server/hermes-schemas.test.ts
index 300bc37..efeb5fe 100644
--- a/tests/server/hermes-schemas.test.ts
+++ b/tests/server/hermes-schemas.test.ts
@@ -21,7 +21,7 @@ describe('Hermes schema initialization', () => {
   })
 
   it('initializes all tables with correct schemas', async () => {
-    const { initAllHermesTables, USAGE_TABLE, SESSIONS_TABLE, MESSAGES_TABLE, GC_ROOMS_TABLE, USERS_TABLE, USER_PROFILES_TABLE, DEVICES_TABLE, MCU_DEVICES_TABLE } =
+    const { initAllHermesTables, USAGE_TABLE, SESSIONS_TABLE, MESSAGES_TABLE, GC_ROOMS_TABLE, USERS_TABLE, USER_PROFILES_TABLE, DEVICES_TABLE } =
       await import('../../packages/server/src/db/hermes/schemas')
 
     expect(() => initAllHermesTables()).not.toThrow()
@@ -35,7 +35,6 @@ describe('Hermes schema initialization', () => {
     expect(tables.map(t => t.name)).toContain(USERS_TABLE)
     expect(tables.map(t => t.name)).toContain(USER_PROFILES_TABLE)
     expect(tables.map(t => t.name)).toContain(DEVICES_TABLE)
-    expect(tables.map(t => t.name)).toContain(MCU_DEVICES_TABLE)
 
     // Verify USAGE_TABLE structure
     const usageCols = db.prepare(`PRAGMA table_info("${USAGE_TABLE}")`).all() as Array<{ name: string }>
@@ -63,13 +62,6 @@ describe('Hermes schema initialization', () => {
     expect(deviceCols.some(c => c.name === 'id')).toBe(true)
     expect(deviceCols.some(c => c.name === 'status')).toBe(true)
     expect(deviceCols.some(c => c.name === 'device_public_key')).toBe(true)
-
-    const mcuDeviceCols = db.prepare(`PRAGMA table_info("${MCU_DEVICES_TABLE}")`).all() as Array<{ name: string }>
-    expect(mcuDeviceCols.some(c => c.name === 'id')).toBe(true)
-    expect(mcuDeviceCols.some(c => c.name === 'name')).toBe(true)
-    expect(mcuDeviceCols.some(c => c.name === 'device_code')).toBe(true)
-    expect(mcuDeviceCols.some(c => c.name === 'is_official')).toBe(true)
-    expect(mcuDeviceCols.some(c => c.name === 'created_at')).toBe(true)
   })
 
   it('preserves existing data when adding safe schema columns', async () => {
diff --git a/tests/server/mcu-devices-store.test.ts b/tests/server/mcu-devices-store.test.ts
deleted file mode 100644
index 37378c3..0000000
--- a/tests/server/mcu-devices-store.test.ts
+++ /dev/null
@@ -1,88 +0,0 @@
-import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
-
-describe('MCU devices store', () => {
-  let db: any = null
-
-  beforeEach(async () => {
-    vi.resetModules()
-    const { DatabaseSync } = await import('node:sqlite')
-    db = new DatabaseSync(':memory:')
-    vi.doMock('../../packages/server/src/db/index', () => ({
-      getDb: () => db,
-      getStoragePath: () => ':memory:',
-    }))
-    const { initAllHermesTables } = await import('../../packages/server/src/db/hermes/schemas')
-    initAllHermesTables()
-  })
-
-  afterEach(() => {
-    db?.close()
-    db = null
-    vi.doUnmock('../../packages/server/src/db/index')
-    vi.resetModules()
-  })
-
-  it('stores official and unofficial MCU devices', async () => {
-    const { createMcuDevice, listMcuDevices } = await import('../../packages/server/src/db/hermes/mcu-devices-store')
-
-    const official = createMcuDevice({
-      name: 'Official Box',
-      deviceCode: 'official-code',
-      isOfficial: true,
-    })
-    const unofficial = createMcuDevice({
-      name: 'Unofficial Box',
-      deviceCode: 'unofficial-code',
-      isOfficial: false,
-    })
-
-    expect(official.is_official).toBe(true)
-    expect(unofficial.is_official).toBe(false)
-    expect(listMcuDevices().map(device => device.device_code).sort()).toEqual(['official-code', 'unofficial-code'])
-  })
-
-  it('rejects duplicate device codes', async () => {
-    const { createMcuDevice } = await import('../../packages/server/src/db/hermes/mcu-devices-store')
-
-    createMcuDevice({
-      name: 'Box',
-      deviceCode: 'duplicate-code',
-      isOfficial: true,
-    })
-
-    expect(() => createMcuDevice({
-      name: 'Box 2',
-      deviceCode: 'duplicate-code',
-      isOfficial: false,
-    })).toThrow('mcu_device_exists')
-  })
-
-  it('updates device name only', async () => {
-    const { createMcuDevice, updateMcuDeviceName } = await import('../../packages/server/src/db/hermes/mcu-devices-store')
-
-    const created = createMcuDevice({
-      name: 'Old Name',
-      deviceCode: 'editable-code',
-      isOfficial: true,
-    })
-    const updated = updateMcuDeviceName(created.id, 'New Name')
-
-    expect(updated.name).toBe('New Name')
-    expect(updated.device_code).toBe('editable-code')
-    expect(updated.is_official).toBe(true)
-  })
-
-  it('deletes MCU devices', async () => {
-    const { createMcuDevice, deleteMcuDevice, listMcuDevices } = await import('../../packages/server/src/db/hermes/mcu-devices-store')
-
-    const created = createMcuDevice({
-      name: 'Delete Me',
-      deviceCode: 'delete-code',
-      isOfficial: false,
-    })
-
-    expect(deleteMcuDevice(created.id)).toBe(true)
-    expect(deleteMcuDevice(created.id)).toBe(false)
-    expect(listMcuDevices()).toEqual([])
-  })
-})
diff --git a/tests/server/no-legacy-brand.test.ts b/tests/server/no-legacy-brand.test.ts
index e5f66bd..d8f74d1 100644
--- a/tests/server/no-legacy-brand.test.ts
+++ b/tests/server/no-legacy-brand.test.ts
@@ -109,12 +109,6 @@ const ALLOWED_LEGACY_BRAND: AllowEntry[] = [
     pattern: /href="https:\/\/hermes-studio\.ai\/"/,
     reason: 'sidebar footer links to the upstream product website',
   },
-  {
-    // 原因：购买徽章指向托管 ESP32 活动的上游文档站
-    file: 'packages/client/src/components/layout/SettingsCircuitBadge.vue',
-    pattern: /const purchaseUrl = 'https:\/\/hermes-studio\.ai\/docs\//,
-    reason: 'purchase badge links to the upstream docs site hosting the ESP32 offer',
-  },
   {
     // 原因：断言旧 MCP 条目会从存量磁盘配置里被清掉
     file: 'tests/server/studio-mcp-autoinject.test.ts',
diff --git a/tests/server/schema-sync.test.ts b/tests/server/schema-sync.test.ts
index 54c4368..fd2aa71 100644
--- a/tests/server/schema-sync.test.ts
+++ b/tests/server/schema-sync.test.ts
@@ -119,8 +119,6 @@ describe('Database Schema Synchronization', () => {
         WORKFLOW_RUNS_SCHEMA,
         WORKFLOW_RUN_NODE_SESSIONS_TABLE,
         WORKFLOW_RUN_NODE_SESSIONS_SCHEMA,
-        MCU_DEVICES_TABLE,
-        MCU_DEVICES_SCHEMA,
       } =
         await import('../../packages/server/src/db/hermes/schemas')
 
@@ -183,22 +181,6 @@ describe('Database Schema Synchronization', () => {
       expect(workflowRunNodeSessionCols.has('session_id')).toBe(true)
       expect(workflowRunNodeSessionCols.has('status')).toBe(true)
       expect(workflowRunNodeSessionCols.has('agent')).toBe(true)
-
-      expect(tableExists(db, MCU_DEVICES_TABLE)).toBe(true)
-      const mcuDeviceCols = getTableColumns(db, MCU_DEVICES_TABLE)
-      expect(mcuDeviceCols.size).toBe(Object.keys(MCU_DEVICES_SCHEMA).length)
-      expect(mcuDeviceCols.has('id')).toBe(true)
-      expect(mcuDeviceCols.has('name')).toBe(true)
-      expect(mcuDeviceCols.has('device_code')).toBe(true)
-      expect(mcuDeviceCols.has('is_official')).toBe(true)
-      expect(mcuDeviceCols.has('created_at')).toBe(true)
-
-      db.prepare(`INSERT INTO "${MCU_DEVICES_TABLE}" (name, device_code, is_official) VALUES (?, ?, ?)`)
-        .run('MCU 1', 'device-code-1', 1)
-      expect(() => {
-        db.prepare(`INSERT INTO "${MCU_DEVICES_TABLE}" (name, device_code, is_official) VALUES (?, ?, ?)`)
-          .run('MCU Duplicate', 'device-code-1', 0)
-      }).toThrow()
     })
   })