- Implemented the Policy-Based Routing Manager in `policy_routing.py` for real-time network change detection.
- Added configuration management, network interface monitoring, and routing rule application features.
- Created a test suite in `test_policy_routing.py` to validate the functionality of the PolicyRoutingManager class.
- Included tests for network calculations, command execution, interface retrieval, and routing application.
- Mocked external dependencies to ensure tests do not affect the actual system configuration.
