加入调试日志

backend/app/services/model_service.py

@@ -106,10 +106,11 @@ async def download_model(model_id: str, use_modelscope: bool = False) -> dict[st
         logger.info(f"Model downloaded: {model_id} -> {local_path}")
         return {"model_id": model_id, "status": "completed", "path": local_path}
     except Exception as e:
-        error_msg = str(e)
-        if "Connection" in error_msg or "timeout" in error_msg.lower() or "network" in error_msg.lower():
-            error_msg += "\n提示: 可能是 HuggingFace 网络问题。尝试使用 ModelScope 下载。"
-        logger.error(f"Model download failed: {e}")
+        import traceback
+
+        tb = traceback.format_exc()
+        logger.error(f"Model download failed: {type(e).__name__}: {e}")
+        logger.error(f"Traceback:\n{tb}")
         return {"model_id": model_id, "status": "failed", "error": error_msg}