bugfix: import DoubaoRealtimeVoice manually

Author: wangyue.demon

02-use-cases/beginner/realtime_voice/agent.py

@@ -65,9 +65,7 @@ async def handle_stream(self, websocket, client_id):
             agent=self.agent,
             session_service=self.session_service,
         )
-        stream_logger.info(
-            f"RealtimeVoice model: {DoubaoRealtimeVoice.model_config}"
-        )
+        stream_logger.info(f"RealtimeVoice model: {DoubaoRealtimeVoice.model_config}")
 
         # Create live request queue
         live_request_queue = LiveRequestQueue()