set env example

.env.example

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+# Server
+PORT=5000
+NODE_ENV=development
+
+# Database (PostgreSQL)
+DATABASE_URL=postgresql://username:password@host:port/dbname
+
+# Supabase
+SUPABASE_URL=https://your-project-id.supabase.co
+SUPABASE_SERVICE_ROLE_KEY=your-secret-service-role-key
+SUPABASE_ANON_KEY=your-anon-key (optional, if you use it anywhere)
+
+# JWT
+JWT_ACCESS_SECRET=your_jwt_access_secret
+JWT_REFRESH_SECRET=your_jwt_refresh_secret
+JWT_ACCESS_EXPIRES_IN=15m
+JWT_REFRESH_EXPIRES_IN=7d
+
+# Bcrypt
+BCRYPT_SALT_ROUNDS=10
+
+# Frontend & Backend URLs
+CLIENT_URL=http://localhost:3000
+BACKEND_URL=http://localhost:5000
+
+# Mailer Config
+MAIL_HOST=smtp.mailtrap.io
+MAIL_PORT=2525
+MAIL_USER=your_smtp_user
+MAIL_PASS=your_smtp_password