Fix CUDA/ROCm compatibility: default to CPU for AMD GPUs

- Change default device to CPU in docker-compose and main.py
- Set compute_type=int8 for CPU inference
- Auto-detect device if env not set

docker-compose.yml

@@ -9,8 +9,8 @@ services:
       - "8000:8000"
     environment:
       - WHISPERX_MODEL=large-v2
-      - WHISPERX_DEVICE=cuda
-      - WHISPERX_COMPUTE_TYPE=float16
+      - WHISPERX_DEVICE=cpu
+      - WHISPERX_COMPUTE_TYPE=int8
       - HF_HUB_DISABLE_TELEMETRY=1
     volumes:
       # Mount Hugging Face cache if needed