final app for testing and deployment

.env.sample

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+# QR Code Manager Environment Configuration
+
+# Application Domain - Used for URL shortener functionality
+# Examples:
+# For development: APP_DOMAIN=localhost:5000
+# For production: APP_DOMAIN=qr.moto-adv.com
+# For production with HTTPS: APP_DOMAIN=https://qr.moto-adv.com
+APP_DOMAIN=localhost:5000
+
+# Flask Configuration
+FLASK_ENV=development
+SECRET_KEY=your-secret-key-change-in-production
+
+# Database Configuration (if using a database in the future)
+# DATABASE_URL=sqlite:///qr_manager.db
+
+# Admin Credentials (optional override)
+# ADMIN_USERNAME=admin
+# ADMIN_PASSWORD_HASH=$2b$12$...  # bcrypt hash of password