- Add user management with roles and permissions (RBAC)
- Implement OAuth2 service provider supporting 4 grant types:
authorization_code, password, client_credentials, refresh_token
- Add JWT authentication with 7-day expiry
- Add admin API for users, roles and OAuth clients management
- Add CLI tool for user management (scripts/user-cli.js)
- Add collapsible sidebar layout with login dialog
- Add user management page and OAuth client management page
- Add server middleware for auth token verification
- Add seed script for initial data (admin/admin123)
