Update go.mod module declaration and all internal imports across the backend codebase to use simplified nexavpn/backend path instead of full GitHub URL.
Extract Claims struct from auth/types.go into dedicated identity package for better separation of concerns. Update all imports and usages across auth service, token handling, and request context utilities.
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
