Copilot Instructions for Exam Manager

Architecture Overview

Backend: TypeScript (Node.js) located in /backend. Uses rjweb-server for the web server and mongodb for the database.
Frontend: React (Vite) located in /frontend. Uses Tailwind CSS for styling and React Router for navigation.
Database: MongoDB. Database connection string is managed via .env file.
Deployment: Backend serves the frontend's built files from /frontend/dist. API routes are prefixed with /api.

Server Framework: rjweb-server. Routes are defined using fileRouter.Path.
Database Access: Use the exported db object from backend/src/index.ts.
Models & Types: Defined in backend/src/types.ts.
Authentication: Session-based using a cookie named exams_session or an api-authentication header. Use authCheck from backend/src/lib/Auth.ts to protect routes.
Static Files: The backend serves the frontend's built files from /frontend/dist. API routes are prefixed with /api.

API Calls: Axios-based. Authentication is handled automatically via cookies. API paths start with /api/.
Types: Always keep frontend/src/types.ts in sync with backend types.
Routing: Managed in frontend/src/App.tsx. Protected routes should verify authentication with the backend.
Icons: Use lucide-react for iconography.

Running with Docker: Use docker-compose up --build to build both stacks and the DB.
Local Backend Dev:
```
cd backend
npm install
npm run dev
```
Local Frontend Dev:
```
cd frontend
npm install
npm run dev
```