Implement real-time WebSocket gateway for presence, DM, and world chat (US-4, US-2)

backend/app/main.py

@@ -7,6 +7,7 @@ from fastapi.middleware.cors import CORSMiddleware
 
 from app.config import settings
 from app.routers import auth, users, worlds, assets, avatar, world_content, internal, presence, groups, social_friends, profiles, chat_dm, chat_reports, chat_world
+from app.gateway import ws
 
 
 from app.services.game_servers import supervisor
@@ -53,6 +54,8 @@ app.include_router(chat_reports.chat_router, prefix="/api/chat", tags=["chat-rep
 app.include_router(chat_reports.moderation_router, prefix="/api/moderation", tags=["moderation"])
 app.include_router(chat_world.router, prefix="/api/chat", tags=["chat-world"])
 app.include_router(chat_world.router, prefix="/v1/chat", tags=["chat-world"])
+app.include_router(ws.router, prefix="/api", tags=["websocket"])
+app.include_router(ws.router, prefix="/v1", tags=["websocket"])
 
 
 @app.get("/api/health")