Phase 004: remove the desktop shell, website tooling, and bundled hermes CLI

- Drop all desktop/Electron branches, scripts, and UI (title bar, pets,
  desktop bridge); LAN endpoint kind is now web/custom only
- Replace the bundled hermes CLI with user-side installation: add
  GET /api/hermes/cli-status plus a HermesMissingView onboarding guide
- Remove the version-management UI (snapshots handled by git) and prune
  dead website/mcu/claude scripts and lockfile entries

packages/client/src/components/layout/AppSidebar.vue

@@ -10,7 +10,6 @@ import ModelSelector from "@/components/layout/ModelSelector.vue";
 import ProfileSelector from "@/components/layout/ProfileSelector.vue";
 import LanguageSwitch from "@/components/layout/LanguageSwitch.vue";
 import ThemeSwitch from "@/components/layout/ThemeSwitch.vue";
-import VersionManagementModal from "@/components/layout/VersionManagementModal.vue";
 import { changelog } from "@/data/changelog";
 import { getStoredUsername, isStoredSuperAdmin } from "@/api/client";
 
@@ -25,11 +24,7 @@ const selectedKey = computed(() => {
 const isSuperAdmin = computed(() => isStoredSuperAdmin());
 const currentUsername = computed(() => getStoredUsername());
 const isVersionPreview = import.meta.env.VITE_HERMES_PREVIEW === '1';
-const isDesktopShell = computed(() =>
-  (window as typeof window & { hermesDesktop?: { isDesktop?: boolean } }).hermesDesktop?.isDesktop === true,
-);
 const showChangelog = ref(false);
-const showVersionManagement = ref(false);
 const showDockerUpdateTip = ref(false);
 const isDockerRuntime = computed(() => appStore.isDocker);
 
@@ -87,10 +82,6 @@ function openChangelog() {
   showChangelog.value = true;
 }
 
-function openVersionManagement() {
-  showVersionManagement.value = true;
-}
-
 function handleDockerUpdateTip() {
   showDockerUpdateTip.value = true;
 }
@@ -361,20 +352,6 @@ function handleUpdateClick() {
         </span>
         <ThemeSwitch />
       </div>
-      <NButton
-        v-if="isDesktopShell"
-        type="primary"
-        size="tiny"
-        block
-        class="update-btn version-management-btn"
-        :class="{ 'has-update': appStore.updateAvailable }"
-        @click="openVersionManagement"
-      >
-        <span class="version-management-label">
-          {{ t('sidebar.versionManagement') }}
-          <span class="version-update-label">{{ t('sidebar.updateAvailableLabel') }}</span>
-        </span>
-      </NButton>
       <NButton v-if="appStore.clientOutdated" type="warning" size="tiny" block class="update-btn" @click="handleReloadClient">
         {{ t('sidebar.reloadClientVersion', { version: appStore.serverVersion }) }}
       </NButton>
@@ -422,7 +399,6 @@ function handleUpdateClick() {
         </div>
       </div>
     </NModal>
-    <VersionManagementModal v-if="isDesktopShell" v-model:show="showVersionManagement" />
 
     <NModal v-model:show="showDockerUpdateTip" preset="dialog" :title="t('sidebar.dockerUpdateTitle')" style="width: 480px;">
       <div class="docker-update-modal">
@@ -695,28 +671,6 @@ function handleUpdateClick() {
   border-radius: $radius-sm;
 }
 
-.version-management-btn {
-  .version-management-label {
-    display: inline-flex;
-    align-items: center;
-    justify-content: center;
-    gap: 6px;
-    min-width: 0;
-  }
-
-  .version-update-label {
-    display: none;
-    flex: 0 0 auto;
-    color: inherit;
-    font-size: 11px;
-    font-weight: 600;
-  }
-
-  &.has-update .version-update-label {
-    display: inline;
-  }
-}
-
 .changelog-list {
   max-height: min(70vh, 640px);
   overflow-y: auto;