优化页面交互并增强 Provider 配置能力

- 表单下拉框不再用 label 包裹，改为 div + aria-label，避免点击后
  下拉面板瞬间关闭
- Provider 卡片新增「从上游获取模型」和「修改」入口，支持编辑
  base URL、API Key 与 api_mode，凭据写入对应的环境变量
- 服务端抽出 provider-model-discovery 统一不同 api_mode 的模型发现，
  旧的 custom_providers 与新的 providers 字典结构都能正确更新
- Agent Bridge 改为后台启动，HTTP 接口在 Python 运行时就绪前即可用；
  worker 连接被拒时按类型重试，不重放可能已产生副作用的请求
- 断线重连后恢复 profiles、models 与会话列表，健康检查改为自调度
  的 setTimeout，离线时 2 秒后重试
- 批量删除确认文案改用 Popconfirm content，避免变成侧栏触发器文本

packages/client/src/components/hermes/models/ProviderCard.vue

@@ -6,6 +6,8 @@ import type { AvailableModelGroup } from '@/api/hermes/system'
 import { useModelsStore } from '@/stores/hermes/models'
 import { useAppStore } from '@/stores/hermes/app'
 import { useChatStore } from '@/stores/hermes/chat'
+import ProviderEditModal from './ProviderEditModal.vue'
+import { fetchProviderModels } from '@/api/hermes/system'
 import { checkCopilotToken, disableCopilot } from '@/api/hermes/copilot-auth'
 import { useI18n } from 'vue-i18n'
 
@@ -24,6 +26,32 @@ const isConfigBackedProvider = computed(() => isCustomProviderKey.value || (!pro
 const isCopilot = computed(() => props.provider.provider === 'copilot')
 const displayName = computed(() => props.provider.label)
 const deleting = ref(false)
+const showEditModal = ref(false)
+const fetchingUpstream = ref(false)
+const canEditProvider = computed(() => isConfigBackedProvider.value || props.provider.credentials_editable || !!props.provider.base_url_env)
+
+async function handleFetchUpstream() {
+  if (fetchingUpstream.value) return
+  fetchingUpstream.value = true
+  try {
+    const result = await fetchProviderModels({
+      provider: props.provider.provider,
+      label: props.provider.label,
+      base_url: props.provider.base_url,
+      api_key: props.provider.api_key,
+      update_cache: true,
+      api_mode: props.provider.api_mode,
+      freeOnly: props.provider.provider === 'openrouter',
+    })
+    await modelsStore.fetchProviders()
+    await appStore.reloadModels()
+    message.success(t('models.upstreamModelsFetched', { count: result.models.length }))
+  } catch (e: any) {
+    message.error(e?.message || t('models.upstreamModelsFailed'))
+  } finally {
+    fetchingUpstream.value = false
+  }
+}
 const destructiveActionLabel = computed(() => {
   if (isConfigBackedProvider.value) return t('common.delete')
   if (isCopilot.value) return t('models.disableProvider')
@@ -302,11 +330,15 @@ async function handleDelete() {
     </div>
 
     <div class="cy-panel-b card-actions">
+      <a-button size="mini" type="text" :loading="fetchingUpstream" :disabled="!provider.base_url || showEditModal" @click="handleFetchUpstream">{{ t('models.fetchUpstreamModels') }}</a-button>
+      <a-button v-if="canEditProvider" size="mini" type="text" :disabled="fetchingUpstream || deleting" @click="showEditModal = true">{{ t('common.edit') }}</a-button>
       <a-button size="mini" type="text" @click="showAliasListModal = true">{{ t('models.aliasManage') }}</a-button>
       <a-button size="mini" type="text" @click="openVisibilityModal">{{ t('models.manageVisibleModels') }}</a-button>
       <a-button size="mini" type="text" status="danger" :loading="deleting" @click="handleDelete">{{ destructiveActionLabel }}</a-button>
     </div>
 
+    <ProviderEditModal v-if="showEditModal" :provider="provider" @close="showEditModal = false" />
+
     <a-modal
       v-model:visible="showAliasListModal"
       :footer="false"