feat: Add Saleor webhook handler with Resend email integration

- Add Resend SDK for transactional emails
- Create React Email templates for order events:
  - OrderConfirmation
  - OrderShipped
  - OrderCancelled
  - OrderPaid
- Multi-language support (SR, EN, DE, FR)
- Customer emails in their language
- Admin emails in English to me@hytham.me and tamara@hytham.me
- Webhook handler at /api/webhooks/saleor
- Supports: ORDER_CONFIRMED, ORDER_FULLY_PAID, ORDER_CANCELLED, ORDER_FULFILLED
- Add GraphQL mutation to create webhooks in Saleor
- Add Resend API key to .env.local

package.json

@@ -10,6 +10,7 @@
   },
   "dependencies": {
     "@apollo/client": "^4.1.6",
+    "@react-email/components": "^1.0.10",
     "clsx": "^2.1.1",
     "framer-motion": "^12.34.4",
     "graphql": "^16.13.1",
@@ -18,6 +19,7 @@
     "next-intl": "^4.8.3",
     "react": "19.2.3",
     "react-dom": "19.2.3",
+    "resend": "^6.9.4",
     "tailwind-merge": "^3.5.0",
     "zustand": "^5.0.11"
   },