feat(前端状态): 添加运维监控状态管理和路由

- 新增 adminSettings store 管理 ops 配置状态
- 注册 adminSettings store 到全局 store
- 添加 ops 监控相关路由（dashboard, alerts, realtime, settings）

frontend/src/router/index.ts

@@ -163,6 +163,18 @@ const routes: RouteRecordRaw[] = [
       descriptionKey: 'admin.dashboard.description'
     }
   },
+  {
+    path: '/admin/ops',
+    name: 'AdminOps',
+    component: () => import('@/views/admin/ops/OpsDashboard.vue'),
+    meta: {
+      requiresAuth: true,
+      requiresAdmin: true,
+      title: 'Ops Monitoring',
+      titleKey: 'admin.ops.title',
+      descriptionKey: 'admin.ops.description'
+    }
+  },
   {
     path: '/admin/users',
     name: 'AdminUsers',

frontend/src/stores/adminSettings.ts

+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { adminAPI } from '@/api'
+
+export const useAdminSettingsStore = defineStore('adminSettings', () => {
+  const loaded = ref(false)
+  const loading = ref(false)
+
+  const readCachedBool = (key: string, defaultValue: boolean): boolean => {
+    try {
+      const raw = localStorage.getItem(key)
+      if (raw === 'true') return true
+      if (raw === 'false') return false
+    } catch {
+      // ignore localStorage failures
+    }
+    return defaultValue
+  }
+
+  const writeCachedBool = (key: string, value: boolean) => {
+    try {
+      localStorage.setItem(key, value ? 'true' : 'false')
+    } catch {
+      // ignore localStorage failures
+    }
+  }
+
+  const readCachedString = (key: string, defaultValue: string): string => {
+    try {
+      const raw = localStorage.getItem(key)
+      if (typeof raw === 'string' && raw.length > 0) return raw
+    } catch {
+      // ignore localStorage failures
+    }
+    return defaultValue
+  }
+
+  const writeCachedString = (key: string, value: string) => {
+    try {
+      localStorage.setItem(key, value)
+    } catch {
+      // ignore localStorage failures
+    }
+  }
+
+  // Default open, but honor cached value to reduce UI flicker on first paint.
+  const opsMonitoringEnabled = ref(readCachedBool('ops_monitoring_enabled_cached', true))
+  const opsRealtimeMonitoringEnabled = ref(readCachedBool('ops_realtime_monitoring_enabled_cached', true))
+  const opsQueryModeDefault = ref(readCachedString('ops_query_mode_default_cached', 'auto'))
+
+  async function fetch(force = false): Promise<void> {
+    if (loaded.value && !force) return
+    if (loading.value) return
+
+    loading.value = true
+    try {
+      const settings = await adminAPI.settings.getSettings()
+      opsMonitoringEnabled.value = settings.ops_monitoring_enabled ?? true
+      writeCachedBool('ops_monitoring_enabled_cached', opsMonitoringEnabled.value)
+
+      opsRealtimeMonitoringEnabled.value = settings.ops_realtime_monitoring_enabled ?? true
+      writeCachedBool('ops_realtime_monitoring_enabled_cached', opsRealtimeMonitoringEnabled.value)
+
+      opsQueryModeDefault.value = settings.ops_query_mode_default || 'auto'
+      writeCachedString('ops_query_mode_default_cached', opsQueryModeDefault.value)
+
+      loaded.value = true
+    } catch (err) {
+      // Keep cached/default value: do not "flip" the UI based on a transient fetch failure.
+      loaded.value = true
+      console.error('[adminSettings] Failed to fetch settings:', err)
+    } finally {
+      loading.value = false
+    }
+  }
+
+  function setOpsMonitoringEnabledLocal(value: boolean) {
+    opsMonitoringEnabled.value = value
+    writeCachedBool('ops_monitoring_enabled_cached', value)
+    loaded.value = true
+  }
+
+  function setOpsRealtimeMonitoringEnabledLocal(value: boolean) {
+    opsRealtimeMonitoringEnabled.value = value
+    writeCachedBool('ops_realtime_monitoring_enabled_cached', value)
+    loaded.value = true
+  }
+
+  function setOpsQueryModeDefaultLocal(value: string) {
+    opsQueryModeDefault.value = value || 'auto'
+    writeCachedString('ops_query_mode_default_cached', opsQueryModeDefault.value)
+    loaded.value = true
+  }
+
+  // Keep UI consistent if we learn that ops is disabled via feature-gated 404s.
+  // (event is dispatched from the axios interceptor)
+  let eventHandlerCleanup: (() => void) | null = null
+
+  function initializeEventListeners() {
+    if (eventHandlerCleanup) return
+
+    try {
+      const handler = () => {
+        setOpsMonitoringEnabledLocal(false)
+      }
+      window.addEventListener('ops-monitoring-disabled', handler)
+      eventHandlerCleanup = () => {
+        window.removeEventListener('ops-monitoring-disabled', handler)
+      }
+    } catch {
+      // ignore window access failures (SSR)
+    }
+  }
+
+  if (typeof window !== 'undefined') {
+    initializeEventListeners()
+  }
+
+  return {
+    loaded,
+    loading,
+    opsMonitoringEnabled,
+    opsRealtimeMonitoringEnabled,
+    opsQueryModeDefault,
+    fetch,
+    setOpsMonitoringEnabledLocal,
+    setOpsRealtimeMonitoringEnabledLocal,
+    setOpsQueryModeDefaultLocal
+  }
+})

frontend/src/stores/index.ts

@@ -5,6 +5,7 @@
 
 export { useAuthStore } from './auth'
 export { useAppStore } from './app'
+export { useAdminSettingsStore } from './adminSettings'
 export { useSubscriptionStore } from './subscriptions'
 export { useOnboardingStore } from './onboarding'