- Add nvidia-smi as intermediate fallback before PyTorch in GPU stats collection
- Fallback order: pynvml -> nvidia-smi -> PyTorch
- Applied to api.py, backend.py, and cluster_client.py GPU stats functions
- nvidia-smi provides accurate memory usage and utilization data
- Fix SocketCommunicator.receive_message() timeout parameter error
- Added optional timeout parameter to receive_message method
- Fixes 'unexpected keyword argument timeout' error in api_stats and backend functions