feat(chat): support public channel chat

app/router/__init__.py

@@ -3,6 +3,7 @@ from __future__ import annotations
 from app.signalr import signalr_router as signalr_router
 
 from .auth import router as auth_router
+from .chat import chat_router as chat_router
 from .fetcher import fetcher_router as fetcher_router
 from .file import file_router as file_router
 from .private import private_router as private_router
@@ -17,6 +18,7 @@ __all__ = [
     "api_v1_router",
     "api_v2_router",
     "auth_router",
+    "chat_router",
     "fetcher_router",
     "file_router",
     "private_router",