[debug] run on CPU

app.py

@@ -34,7 +34,7 @@ class ModelManager:
         t2t_context_model: str = "Qwen/Qwen3-0.6B",
         t2t_answer_model: str = "Qwen/Qwen2.5-0.5B-Instruct",
         c2c_checkpoint_path: str = "local/checkpoints/qwen3_0.6b+qwen2.5_0.5b_Fuser",
-        device: str = "cuda"
+        device: str = "auto"
     ):
         """
         Initialize ModelManager with model configurations.