fix: 客户端和网关只能通过长连接方式通信，移除 HTTP 注册端点

backend/gateway/internal/router/router.go

@@ -41,64 +41,10 @@ func (r *Router) SetupRoutes() http.Handler {
 	// 健康检查
 	mux.HandleFunc("/health", r.handleHealth)
 
-	// 用户注册
-	mux.HandleFunc("/api/user/register", r.handleRegister)
-
 	return mux
 }
 
-// 注册请求结构
-type registerRequest struct {
-	Account  string `json:"account"`
-	Password string `json:"password"`
-}
 
-// 注册响应结构
-type registerResponse struct {
-	UserID   string `json:"user_id"`
-	Account  string `json:"account"`
-	Message  string `json:"message"`
-	Code     int    `json:"code"`
-}
-
-// handleRegister 处理用户注册请求
-func (r *Router) handleRegister(w http.ResponseWriter, req *http.Request) {
-	if req.Method != http.MethodPost {
-		w.WriteHeader(http.StatusMethodNotAllowed)
-		w.Write([]byte(`{"code": 405, "message": "Method not allowed"}`))
-		return
-	}
-
-	// 解析请求体
-	var registerReq registerRequest
-	if err := json.NewDecoder(req.Body).Decode(&registerReq); err != nil {
-		w.WriteHeader(http.StatusBadRequest)
-		w.Write([]byte(`{"code": 400, "message": "Invalid request body"}`))
-		return
-	}
-
-	// 调用用户服务注册
-	resp, err := r.userService.Register(req.Context(), registerReq.Account, registerReq.Password)
-	if err != nil {
-		log.Printf("Register failed: %v", err)
-		w.WriteHeader(http.StatusInternalServerError)
-		w.Write([]byte(`{"code": 500, "message": "Internal server error"}`))
-		return
-	}
-
-	// 构造响应
-	response := registerResponse{
-		UserID:   resp.UserId,
-		Account:  resp.Account,
-		Message:  resp.Response.Message,
-		Code:     int(resp.Response.Code),
-	}
-
-	// 返回响应
-	w.Header().Set("Content-Type", "application/json")
-	w.WriteHeader(http.StatusOK)
-	json.NewEncoder(w).Encode(response)
-}
 
 func (r *Router) handleWebSocket(w http.ResponseWriter, req *http.Request) {
 	conn, err := upgrader.Upgrade(w, req, nil)