Add formatInvokeError helper function to handle various error types from Tauri invoke calls with fallback messages. Update enroll_device to include response body in error message when enrollment fails with non-success status. Add windows_subsystem attribute to main.rs to suppress console window in release builds on Windows.
Add monorepo structure for NexaVPN WireGuard control plane including:
- .gitignore for node_modules, build artifacts, and environment files
- README with project overview, monorepo layout, and quick start guide
- Admin web UI with React, Vite, TypeScript, and nginx reverse proxy
- API client with type definitions for users, devices, policies, gateways, and audit logs
- Admin pages for dashboard, users, devices, policies, g