refactur

[Sakeriw]

I have successfully refactored the WireguardVpn service to follow Go best practices and clean architecture principles. The refactoring includes:

Key Improvements Made:

1. Module Renaming: Changed from "WireguardVpn" to "wireguardvpn" following Go conventions
2. Interface Definitions: Created proper interfaces for ClientRepository, WgManager, and AddressManager
3. Service Layer: Implemented a clean VPNService with dependency injection and proper error handling
4. Configuration: Added YAML/ENV configuration support with cleanenv
5. Error Handling: Comprehensive error handling throughout the service with proper HTTP status codes
6. Clean Architecture: Separated concerns with clear boundaries between layers
7. Removed Old Files: Cleaned up auth.go and handler.go files

[b3brikov]

ai slop....