- Add backend/node_modules to .gitignore
- Untrack backend/node_modules from git
- Restore backend source files (go.mod, main.go, etc.) that were missing in HEAD
- Include frontend test updates
- Deleted Caddy configuration types and validation logic from the backend.
- Removed associated test files for validation.
- Cleaned up related service and model files that are no longer needed.
- Removed unnecessary environment configuration and database connection code.
- Eliminated unused models related to access control, SSL certificates, and user management.
- Cleaned up node modules by removing unnecessary binaries.
