* feat: implement admin authentication with OpenID & Local Auth proxy support
* feat: implement admin OAuth exchange flow with caching support
- Added caching for admin OAuth exchange codes with a short TTL.
- Introduced new endpoints for generating and exchanging admin OAuth codes.
- Updated relevant controllers and routes to handle admin panel redirects and token exchanges.
- Enhanced logging for better traceability of OAuth operations.
* refactor: enhance OpenID strategy mock to support multiple verify callbacks
- Updated the OpenID strategy mock to store and retrieve verify callbacks by strategy name.
- Improved backward compatibility by maintaining a method to get the last registered callback.
- Adjusted tests to utilize the new callback retrieval methods, ensuring clarity in the verification process for the 'openid' strategy.
* refactor: reorder import statements for better organization
* refactor: admin OAuth flow with improved URL handling and validation
- Added a utility function to retrieve the admin panel URL, defaulting to a local development URL if not set in the environment.
- Updated the OAuth exchange endpoint to include validation for the authorization code format.
- Refactored the admin panel redirect logic to handle URL parsing more robustly, ensuring accurate origin comparisons.
- Removed redundant local URL definitions from the codebase for better maintainability.
* refactor: remove deprecated requireAdmin middleware and migrate to TypeScript
- Deleted the old requireAdmin middleware file and its references in the middleware index.
- Introduced a new TypeScript version of the requireAdmin middleware with enhanced error handling and logging.
- Updated routes to utilize the new requireAdmin middleware, ensuring consistent access control for admin routes.
* feat: add requireAdmin middleware for admin role verification
- Introduced requireAdmin middleware to enforce admin role checks for authenticated users.
- Implemented comprehensive error handling and logging for unauthorized access attempts.
- Added unit tests to validate middleware functionality and ensure proper behavior for different user roles.
- Updated middleware index to include the new requireAdmin export.
