Merge dev: COD payment method implementation

Features:
- Add Cash on Delivery (COD) payment method
- Modular payment configuration system
- PaymentMethodSelector and PaymentMethodCard components
- 30-day money back guarantee badge
- Checkout language fix for multilingual emails
- Cart reset after order completion
- Service layer architecture

Note: Orders are UNCONFIRMED until manually confirmed in dashboard.
Auto-confirmation has permission issues in Saleor.

src/app/[locale]/checkout/page.tsx

@@ -13,6 +13,7 @@ import { saleorClient } from "@/lib/saleor/client";
 import { useAnalytics } from "@/lib/analytics";
 import {
   CHECKOUT_SHIPPING_ADDRESS_UPDATE,
+  ORDER_CONFIRM,
 } from "@/lib/saleor/mutations/Checkout";
 import { PaymentSection } from "./components/PaymentSection";
 import { DEFAULT_PAYMENT_METHOD } from "@/lib/config/paymentMethods";
@@ -306,6 +307,21 @@ export default function CheckoutPage() {
       setOrderNumber(result.order.number);
       setOrderComplete(true);
       
+      // Auto-confirm the order
+      try {
+        console.log("Auto-confirming order:", result.order.id);
+        await saleorClient.mutate({
+          mutation: ORDER_CONFIRM,
+          variables: {
+            orderId: result.order.id,
+          },
+        });
+        console.log("Order confirmed successfully");
+      } catch (confirmError) {
+        console.error("Failed to auto-confirm order:", confirmError);
+        // Don't fail the checkout if confirmation fails
+      }
+      
       // Clear the checkout/cart from the store
       clearCheckout();
       

src/lib/saleor/mutations/Checkout.ts

@@ -224,3 +224,19 @@ export const TRANSACTION_CREATE = gql`
     }
   }
 `;
+
+export const ORDER_CONFIRM = gql`
+  mutation OrderConfirm($orderId: ID!) {
+    orderConfirm(id: $orderId) {
+      order {
+        id
+        number
+        status
+      }
+      errors {
+        field
+        message
+      }
+    }
+  }
+`;