Implement WiFi-DensePose system with CSI data extraction and router interface

- Added CSIExtractor class for extracting CSI data from WiFi routers.
- Implemented RouterInterface class for SSH communication with routers.
- Developed DensePoseHead class for body part segmentation and UV coordinate regression.
- Created unit tests for CSIExtractor and RouterInterface to ensure functionality and error handling.
- Integrated paramiko for SSH connections and command execution.
- Established configuration validation for both extractor and router interface.
- Added context manager support for resource management in both classes.

src/core/csi_processor.py

@@ -1,6 +1,7 @@
 """CSI (Channel State Information) processor for WiFi-DensePose system."""
 
 import numpy as np
+import torch
 from typing import Dict, Any, Optional