Add password support to multiplayer rooms

Introduces a password field to the Room model and database schema, enabling password-protected multiplayer rooms. Adds LIO router endpoints for room creation, user join/leave, and updates related imports and router registrations.

app/router/__init__.py

@@ -5,6 +5,7 @@ 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
+from .lio import router as lio_router
 from .notification import chat_router as chat_router
 from .private import private_router as private_router
 from .redirect import (
@@ -21,6 +22,7 @@ __all__ = [
     "chat_router",
     "fetcher_router",
     "file_router",
+    "lio_router",
     "private_router",
     "redirect_api_router",
     "redirect_router",