feat(websocket): 实现 WebSocket 消息推送功能

- 配置 ASGI 支持 WebSocket 连接
- 新增 WebSocket 路由和消费者类 MegCenter
- 实现消息序列化和推送逻辑
- 前端集成 WebSocket 连接状态管理和重连机制
- 添加用户在线状态提示和未读消息提醒- 更新角色权限配置显示条件
- 扩展用户信息存储结构支持 WebSocket 状态字段

backend/application/asgi.py

@@ -8,14 +8,25 @@ https://docs.djangoproject.com/en/3.2/howto/deployment/asgi/
 """
 
 import os
-from channels.routing import ProtocolTypeRouter
+
+from channels.auth import AuthMiddlewareStack
+from channels.routing import ProtocolTypeRouter, URLRouter
+from channels.security.websocket import AllowedHostsOriginValidator
 from django.core.asgi import get_asgi_application
 
 os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'application.settings')
 os.environ["DJANGO_ALLOW_ASYNC_UNSAFE"] = "true"
 
 http_application = get_asgi_application()
+from application.ws_routing import websocket_urlpatterns
 
 application = ProtocolTypeRouter({
     "http": http_application,
+    'websocket': AllowedHostsOriginValidator(
+            AuthMiddlewareStack(
+                URLRouter(
+                    websocket_urlpatterns  # 指明路由文件是devops/routing.py
+                )
+            )
+        ),
 })