feat: support command in mcp

Author: ulleo

backend/apps/chat/api/chat.py

@@ -357,7 +357,11 @@ async def analysis_or_predict(session: SessionDep, current_user: CurrentUser, ch
         traceback.print_exc()
         if stream:
             def _err(_e: Exception):
-                yield 'data:' + orjson.dumps({'content': str(_e), 'type': 'error'}).decode() + '\n\n'
+                if in_chat:
+                    yield 'data:' + orjson.dumps({'content': str(_e), 'type': 'error'}).decode() + '\n\n'
+                else:
+                    yield f'❌ **ERROR:**\n'
+                    yield f'> {str(_e)}\n'
 
             return StreamingResponse(_err(e), media_type="text/event-stream")
         else: