PORT=3001 HOST=0.0.0.0 NODE_ENV=development SESSION_SECRET=your_session_secret ADMIN_USERNAME=admin ADMIN_PASSWORD=admin1234 BACKEND_URL=https://cms.hailearning.edu.vn/ FRONTEND_URL=https://www.hailearning.edu.vn/ ADMIN_GROUP=admin MANAGER_GROUP=manager MONGODB_URI=mongodb://localhost:27017/uldp # API key for public verification endpoints # Used by: GET /api/verify-degree/:id?api_key=xxx # GET /api/verify-certificate/:id?api_key=xxx API_KEY=your_api_key_here # Secret for signing document URLs (HMAC-SHA256, keep this private) FILE_SIGN_SECRET=change-this-to-a-random-secret-string