fix: 第二轮修复 — 数据库启动检查、会话持久化、URL路由、设备排序等

1. DevTools 启动前检查数据库状态，失败时自动尝试启动
2. ai-core 添加数据库断线重连机制 (30秒间隔)
3. Dashboard 添加数据库状态卡片 (启动/停止/重启)
4. Gateway 会话空闲超时管理 (30分钟标记空闲)
5. 会话/消息 PostgreSQL 持久化 (SessionStore + REST API)
6. 前端服务端会话持久化 + URL hash 路由 + 侧边栏管理
7. 管理员回到主对话按钮
8. IoT 设备卡片固定排序
9. 更新相关文档

backend/gateway/internal/router/router.go

@@ -9,17 +9,18 @@ import (
 	"github.com/yourname/cyrene-ai/gateway/internal/config"
 	"github.com/yourname/cyrene-ai/gateway/internal/handler"
 	"github.com/yourname/cyrene-ai/gateway/internal/middleware"
+	"github.com/yourname/cyrene-ai/gateway/internal/store"
 	"github.com/yourname/cyrene-ai/gateway/internal/ws"
 )
 
 // Setup 注册所有路由
-func Setup(r *gin.Engine, hub *ws.Hub, cfg *config.Config) {
+func Setup(r *gin.Engine, hub *ws.Hub, cfg *config.Config, sessionStore *store.SessionStore) {
 	// 限流器
 	rateLimiter := middleware.NewRateLimiter(10, 20) // 每秒10个请求，突发20
 
 	// 初始化处理器
 	authHandler := handler.NewAuthHandler(cfg)
-	sessionHandler := handler.NewSessionHandler(hub)
+	sessionHandler := handler.NewSessionHandler(hub, sessionStore)
 	memoryHandler := handler.NewMemoryHandler(cfg.AICoreURL)
 	chatHandler := handler.NewChatHandler(cfg, hub)
 	webhookHandler := handler.NewWebhookHandler(cfg, hub)
@@ -54,11 +55,13 @@ func Setup(r *gin.Engine, hub *ws.Hub, cfg *config.Config) {
 		// 会话管理
 			sessions := protected.Group("/sessions")
 				{
-					sessions.POST("", sessionHandler.Create)
-					sessions.GET("", sessionHandler.List)
-					sessions.GET("/:id", sessionHandler.Get)
-					sessions.DELETE("/:id", sessionHandler.Delete)
-					sessions.GET("/:id/messages", sessionHandler.GetMessages)
+					sessions.POST("", sessionHandler.Create)         // POST   /api/v1/sessions
+					sessions.GET("", sessionHandler.List)            // GET    /api/v1/sessions?user_id=xxx
+					sessions.DELETE("", sessionHandler.DeleteAll)    // DELETE /api/v1/sessions?user_id=xxx
+					sessions.GET("/:id", sessionHandler.Get)         // GET    /api/v1/sessions/:id
+					sessions.DELETE("/:id", sessionHandler.Delete)   // DELETE /api/v1/sessions/:id
+					sessions.GET("/:id/messages", sessionHandler.GetMessages)       // GET    /api/v1/sessions/:id/messages?limit=50
+					sessions.DELETE("/:id/messages", sessionHandler.ClearMessages)  // DELETE /api/v1/sessions/:id/messages
 				}
 
 		// 记忆管理