feat: Custom Pizza Feature and Code Optimizations

.env.example

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+# Server Configuration
+NODE_ENV=development
+PORT=5000
+
+# Frontend URL (used in emails, CORS, etc.)
+# For production: https://your-frontend.vercel.app
+FRONTEND_URL=http://localhost:5173
+
+# CORS Configuration (comma-separated list of allowed origins)
+ALLOWED_ORIGINS=http://localhost:3000,http://localhost:5173
+
+# MongoDB Connection (Docker Container)
+# Option 1: If using existing mongo-dev container (no auth)
+MONGO_URI=mongodb://localhost:27017/pizza-delivery-app
+
+# Option 2: If using docker-compose.yml with authentication
+# MONGO_URI=mongodb://admin:password123@localhost:27017/pizza-delivery-app?authSource=admin
+
+# Authentication
+# Generate a strong secret for production: openssl rand -base64 32
+JWT_SECRET=your_super_secret_jwt_key_change_this_in_production
+SALT=10
+
+# Email Configuration (Nodemailer)
+# For Gmail: Enable 2FA and create an App Password
+SENDER_EMAIL=your_email@example.com
+SENDER_PASSWORD=your_email_app_password
+SUPERADMIN_EMAIL=admin@example.com
+
+# Payment Gateway (Razorpay)
+# Sign up at https://razorpay.com/ to get API keys
+RAZORPAY_KEY_ID=your_razorpay_key_id
+RAZORPAY_KEY_SECRET=your_razorpay_key_secret
+RAZORPAY_WEBHOOK_SECRET=your_razorpay_webhook_secret