## What's New

### Added
- Port forwarding management (Get, New, Set, Remove)
- Added unit tests for interface management

### Changed
- Updated IPNetwork2 library from version 2.6.618 to 3.1.764
- Updated code to use the new namespace (System.Net) for IPNetwork2
- Added support for .NET 8.0 and .NET 9.0
- Improved XML documentation for all classes and methods
- Made OPNSenseApiClient more testable by introducing an interface
