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

Dockerfile

@@ -1,5 +1,5 @@
 # Use ROCm PyTorch base image with compatible PyTorch
-FROM rocm/pytorch:2.4.0-rocm6.0-cxx11-ubuntu22.04
+FROM rocm/pytorch:rocm7.2.3_ubuntu22.04_py3.10_pytorch_release_2.10.0
 
 # Set environment variables for ROCm and Python
 ENV PYTHONDONTWRITEBYTECODE=1