接入运维真实 metrics：负载、请求错误率与服务探测

- 新增 GET /admin/ops/metrics 与进程内请求统计中间件
- 运维页展示 CPU/内存/磁盘、24h 曲线与 WS/DB/存储状态
- 去掉未使用的消息队列占位项

server/internal/handler/router.go

@@ -13,7 +13,7 @@ func SetupRoutes(r *gin.Engine, store storage.ObjectStorage, storageCfg config.S
 	customer := NewCustomerHandler()
 	knowledge := NewKnowledgeHandler()
 	stats := NewStatisticsHandler()
-	admin := NewAdminHandler()
+	admin := NewAdminHandler(store)
 	channel := NewChannelHandler()
 	settings := NewSettingsHandler()
 	staff := NewStaffHandler()
@@ -116,6 +116,7 @@ func SetupRoutes(r *gin.Engine, store storage.ObjectStorage, storageCfg config.S
 		adminGroup.Use(middleware.PlatformRequired())
 		{
 			adminGroup.GET("/stats", admin.Stats)
+			adminGroup.GET("/ops/metrics", admin.OpsMetrics)
 			adminGroup.GET("/tenants", admin.ListTenants)
 			adminGroup.GET("/tenants/:id", admin.GetTenant)
 			adminGroup.POST("/tenants", admin.CreateTenant)