feat: send ticket receipts via WhatsApp and normalize phone numbers

Add WhatsApp API integration for automated receipt delivery
Enforce country codes for all phone number inputs (defaults to +60)

server/api/public/bookings/[token]/confirm.post.ts

@@ -1,7 +1,10 @@
+import type { ConfirmBookingResponse } from '~~/shared/booking'
+
 import { confirmBookingByConfirmationToken, getBookingByConfirmationToken, getBookingInventorySummary } from '../../../../utils/booking-repository'
 import { getRequiredRouteParam, httpError } from '../../../../utils/http'
+import { sendBookingTicketReceiptViaWhatsApp } from '../../../../utils/whatsapp'
 
-export default defineEventHandler(async (event) => {
+export default defineEventHandler(async (event): Promise<ConfirmBookingResponse> => {
   const token = getRequiredRouteParam(event, 'token', 'Confirmation token')
   const existingBooking = await getBookingByConfirmationToken(token)
 
@@ -12,7 +15,14 @@ export default defineEventHandler(async (event) => {
   if (existingBooking.status === 'confirmed') {
     return {
       booking: existingBooking,
-      alreadyConfirmed: true
+      alreadyConfirmed: true,
+      ticketReceiptWhatsApp: {
+        sent: false,
+        skipped: true,
+        recipientPhone: existingBooking.customerPhone,
+        apiRecipientPhone: existingBooking.customerPhone.replace(/\D/g, ''),
+        error: 'Booking was already confirmed earlier.'
+      }
     }
   }
 
@@ -28,8 +38,11 @@ export default defineEventHandler(async (event) => {
     httpError(404, 'Booking not found')
   }
 
+  const ticketReceiptWhatsApp = await sendBookingTicketReceiptViaWhatsApp(event, booking)
+
   return {
     booking,
-    alreadyConfirmed: false
+    alreadyConfirmed: false,
+    ticketReceiptWhatsApp
   }
 })