feat (infra): Trae 完成 asset_helper_backend 微服务基础架构 V1 初始化

核心实现：搭建 Monorepo 架构，完成 shared 共享包、gateway、user-service 基础框架开发
技术落地：严格匹配指定技术栈版本，完成 Docker、gRPC、FastAPI、PostgreSQL、Redis 等配置，实现服务间基础连通
配套文件：生成 Makefile、环境变量模板、数据库 / 脚本初始化文件及启动验证文档
架构定位：仅搭建基础架构骨架，无任何业务逻辑、业务规则及业务相关字段，为后续业务开发提供支撑

asset_helper_backend/services/gateway/app/ws/handlers.py

@@ -0,0 +1,22 @@
+from fastapi import WebSocket, WebSocketDisconnect
+from app.ws.manager import manager
+import uuid
+
+async def websocket_handler(websocket: WebSocket):
+    client_id = str(uuid.uuid4())
+    await manager.connect(websocket, client_id)
+    
+    try:
+        while True:
+            data = await websocket.receive()
+            
+            if "text" in data:
+                message = data["text"]
+                await manager.send_personal_message(f"You said: {message}", client_id)
+                await manager.broadcast(f"Client {client_id} said: {message}")
+            elif "bytes" in data:
+                # 处理二进制消息
+                await websocket.send_bytes(data["bytes"])
+    except WebSocketDisconnect:
+        manager.disconnect(client_id)
+        await manager.broadcast(f"Client {client_id} disconnected")

asset_helper_backend/services/gateway/app/ws/manager.py

@@ -0,0 +1,24 @@
+from fastapi import WebSocket
+from typing import Dict, List
+
+class ConnectionManager:
+    def __init__(self):
+        self.active_connections: Dict[str, WebSocket] = {}
+    
+    async def connect(self, websocket: WebSocket, client_id: str):
+        await websocket.accept()
+        self.active_connections[client_id] = websocket
+    
+    def disconnect(self, client_id: str):
+        if client_id in self.active_connections:
+            del self.active_connections[client_id]
+    
+    async def send_personal_message(self, message: str, client_id: str):
+        if client_id in self.active_connections:
+            await self.active_connections[client_id].send_text(message)
+    
+    async def broadcast(self, message: str):
+        for connection in self.active_connections.values():
+            await connection.send_text(message)
+
+manager = ConnectionManager()