feat: implement pricing strategy, subscription tiers, and core infrastructure for QR code management

src/app/(main)/(app)/settings/page.tsx

@@ -165,6 +165,8 @@ export default function SettingsPage() {
         return { dynamic: 50, price: '€9', period: 'per month' };
       case 'BUSINESS':
         return { dynamic: 500, price: '€29', period: 'per month' };
+      case 'ENTERPRISE':
+        return { dynamic: 99999, price: 'Custom', period: 'per month' };
       default:
         return { dynamic: 3, price: '€0', period: 'forever' };
     }