Use decoupled way for backend client

app/main.py

@@ -20,6 +20,7 @@ except ImportError:
     logger.warning("aiortc not available - WebRTC endpoint will be disabled")
 
 from app.config import settings
+from app.backend_adapters import build_backend_adapter_from_settings
 from core.transports import SocketTransport, WebRtcTransport, BaseTransport
 from core.session import Session
 from processors.tracks import Resampled16kTrack
@@ -75,6 +76,7 @@ app.add_middleware(
 
 # Active sessions storage
 active_sessions: Dict[str, Session] = {}
+backend_gateway = build_backend_adapter_from_settings()
 
 # Configure logging
 logger.remove()
@@ -164,7 +166,7 @@ async def websocket_endpoint(websocket: WebSocket):
 
     # Create transport and session
     transport = SocketTransport(websocket)
-    session = Session(session_id, transport)
+    session = Session(session_id, transport, backend_gateway=backend_gateway)
     active_sessions[session_id] = session
 
     logger.info(f"WebSocket connection established: {session_id}")
@@ -243,7 +245,7 @@ async def webrtc_endpoint(websocket: WebSocket):
 
     # Create transport and session
     transport = WebRtcTransport(websocket, pc)
-    session = Session(session_id, transport)
+    session = Session(session_id, transport, backend_gateway=backend_gateway)
     active_sessions[session_id] = session
 
     logger.info(f"WebRTC connection established: {session_id}")