refactor: abstract site URL across email templates

- Add NEXT_PUBLIC_SITE_URL to .env.local
- Update email templates to accept siteUrl prop
- Update webhook handler to pass siteUrl from env var
- Update create-webhooks.graphql with placeholder URL

src/lib/saleor/create-webhooks.graphql

@@ -1,7 +1,11 @@
+# Replace YOUR_STOREFRONT_URL with your actual storefront URL
+# Dev: https://dev.manoonoils.com
+# Prod: https://manoonoils.com
+
 mutation CreateSaleorWebhooks {
   orderConfirmedWebhook: webhookCreate(input: {
     name: "Resend - Order Confirmed"
-    targetUrl: "https://manoonoils.com/api/webhooks/saleor"
+    targetUrl: "YOUR_STOREFRONT_URL/api/webhooks/saleor"
     events: [ORDER_CONFIRMED]
     isActive: true
   }) {
@@ -20,7 +24,7 @@ mutation CreateSaleorWebhooks {
 
   orderPaidWebhook: webhookCreate(input: {
     name: "Resend - Order Paid"
-    targetUrl: "https://manoonoils.com/api/webhooks/saleor"
+    targetUrl: "YOUR_STOREFRONT_URL/api/webhooks/saleor"
     events: [ORDER_FULLY_PAID]
     isActive: true
   }) {
@@ -39,7 +43,7 @@ mutation CreateSaleorWebhooks {
 
   orderCancelledWebhook: webhookCreate(input: {
     name: "Resend - Order Cancelled"
-    targetUrl: "https://manoonoils.com/api/webhooks/saleor"
+    targetUrl: "YOUR_STOREFRONT_URL/api/webhooks/saleor"
     events: [ORDER_CANCELLED]
     isActive: true
   }) {
@@ -58,7 +62,7 @@ mutation CreateSaleorWebhooks {
 
   orderFulfilledWebhook: webhookCreate(input: {
     name: "Resend - Order Fulfilled"
-    targetUrl: "https://manoonoils.com/api/webhooks/saleor"
+    targetUrl: "YOUR_STOREFRONT_URL/api/webhooks/saleor"
     events: [ORDER_FULFILLED]
     isActive: true
   }) {