websocket：统一WebSocket网关配置

- 为CleanWebSocketGateway添加/game路径配置
- 支持通过环境变量WEBSOCKET_PORT配置端口
- 移除ZulipWebSocketGateway的模块引用
- 统一使用CleanWebSocketGateway作为唯一WebSocket网关
- 更新模块注释，反映当前架构

src/business/zulip/clean_websocket.gateway.ts

@@ -31,9 +31,12 @@ export class CleanWebSocketGateway implements OnModuleInit, OnModuleDestroy {
   ) {}
 
   async onModuleInit() {
-    const port = 3001;
+    const port = process.env.WEBSOCKET_PORT ? parseInt(process.env.WEBSOCKET_PORT) : 3001;
     
-    this.server = new WebSocket.Server({ port });
+    this.server = new WebSocket.Server({ 
+      port,
+      path: '/game'  // 统一使用 /game 路径
+    });
 
     this.server.on('connection', (ws: ExtendedWebSocket) => {
       ws.id = this.generateClientId();
@@ -71,7 +74,7 @@ export class CleanWebSocketGateway implements OnModuleInit, OnModuleDestroy {
       });
     });
 
-    this.logger.log(`WebSocket服务器启动成功，端口: ${port}`);
+    this.logger.log(`WebSocket服务器启动成功，端口: ${port}，路径: /game`);
   }
 
   async onModuleDestroy() {