feat(websocket): integrate WebSocket support and refactor SSE handling

- Added WebSocket support by introducing a new WSHandler and related infrastructure.
- Replaced SSE implementations with WebSocket equivalents across message and QR code handlers.
- Updated service and repository layers to utilize WebSocket for real-time messaging.
- Removed obsolete SSE hub and related code, streamlining the application for WebSocket usage.
- Enhanced router to include WebSocket endpoints for real-time communication.

cmd/server/wire.go

@@ -50,6 +50,7 @@ func ProvideRouter(
 	logService *service.LogService,
 	activityService service.UserActivityService,
 	casbinService service.CasbinService,
+	wsHandler *handler.WSHandler,
 ) *router.Router {
 	return router.New(
 		userHandler,
@@ -78,5 +79,6 @@ func ProvideRouter(
 		logService,
 		activityService,
 		casbinService,
+		wsHandler,
 	)
 }