feat: 实现网关服务的长连接功能

backend/gateway/cmd/main.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+
+	"backend/gateway/internal/config"
+	"backend/gateway/internal/router"
+	"backend/gateway/internal/ws"
+)
+
+func main() {
+	// 加载配置
+	cfg, err := config.Load()
+	if err != nil {
+		log.Fatalf("Failed to load config: %v", err)
+	}
+
+	// 创建 WebSocket Hub
+	hub := ws.NewHub()
+	go hub.Run()
+
+	// 创建路由器
+	r := router.NewRouter(hub)
+
+	// 启动服务器
+	serverAddr := fmt.Sprintf(":%d", cfg.Server.Port)
+	log.Printf("Gateway service starting on %s", serverAddr)
+	log.Printf("WebSocket endpoint: ws://localhost%s/ws", serverAddr)
+	log.Printf("Health check: http://localhost%s/health", serverAddr)
+
+	if err := http.ListenAndServe(serverAddr, r.SetupRoutes()); err != nil {
+		log.Fatalf("Failed to start server: %v", err)
+	}
+}