refactor(signalr): remove SignalR server & msgpack_lazer_api

Maybe we can make `msgpack_lazer_api` independent?

app/router/__init__.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-# from app.signalr import signalr_router as signalr_router
 from .auth import router as auth_router
 from .fetcher import fetcher_router as fetcher_router
 from .file import file_router as file_router
@@ -25,5 +24,4 @@ __all__ = [
     "private_router",
     "redirect_api_router",
     "redirect_router",
-    # "signalr_router",
 ]