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

src/lib/saleor/create-webhooks.graphql

@@ -0,0 +1,77 @@
+mutation CreateSaleorWebhooks {
+  orderConfirmedWebhook: webhookCreate(input: {
+    name: "Resend - Order Confirmed"
+    targetUrl: "https://manoonoils.com/api/webhooks/saleor"
+    events: [ORDER_CONFIRMED]
+    isActive: true
+  }) {
+    webhook {
+      id
+      name
+      targetUrl
+      isActive
+    }
+    errors {
+      field
+      message
+      code
+    }
+  }
+
+  orderPaidWebhook: webhookCreate(input: {
+    name: "Resend - Order Paid"
+    targetUrl: "https://manoonoils.com/api/webhooks/saleor"
+    events: [ORDER_FULLY_PAID]
+    isActive: true
+  }) {
+    webhook {
+      id
+      name
+      targetUrl
+      isActive
+    }
+    errors {
+      field
+      message
+      code
+    }
+  }
+
+  orderCancelledWebhook: webhookCreate(input: {
+    name: "Resend - Order Cancelled"
+    targetUrl: "https://manoonoils.com/api/webhooks/saleor"
+    events: [ORDER_CANCELLED]
+    isActive: true
+  }) {
+    webhook {
+      id
+      name
+      targetUrl
+      isActive
+    }
+    errors {
+      field
+      message
+      code
+    }
+  }
+
+  orderFulfilledWebhook: webhookCreate(input: {
+    name: "Resend - Order Fulfilled"
+    targetUrl: "https://manoonoils.com/api/webhooks/saleor"
+    events: [ORDER_FULFILLED]
+    isActive: true
+  }) {
+    webhook {
+      id
+      name
+      targetUrl
+      isActive
+    }
+    errors {
+      field
+      message
+      code
+    }
+  }
+}