Fix Audio class import

- Import Audio class from hf_AC.inf module
- Ensure reference audio processing works correctly
- Fix missing dependency for audio preprocessing

app.py

@@ -82,6 +82,7 @@ try:
     from hf_AC.mmaudio.model.flow_matching import FlowMatching
     from hf_AC.mmaudio.model.networks import MMAudio, get_my_mmaudio
     from hf_AC.mmaudio.model.utils.features_utils import FeaturesUtils
+    from hf_AC.inf import Audio
     
     # Setup logging
     setup_eval_logging()