Add Step Audio EditX Mac (MPS) compatibility patch
Technical details:
- Create centralized device compatibility patch system
- Monkey-patch hardcoded CUDA device calls in upsample_encoder_v2.py
- Detect device from model parameters instead of hardcoding
- Gracefully disable CUDA Graphs on non-CUDA devices (MPS/CPU)
- Apply patch automatically when Step Audio EditX engine loads
Addresses issue #245 (requires Mac user testing)
