feat(bookings): add payment and document upload to confirmation page

Allow users to select payment method and upload receipts before confirming.
Add public API endpoints for payment updates and document management.

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

@@ -5,7 +5,7 @@ import { getRequiredRouteParam, httpError } from '../../../../utils/http'
 
 export default defineEventHandler(async (event): Promise<CancelBookingConfirmationResponse> => {
   const token = getRequiredRouteParam(event, 'token', 'Confirmation token')
-  const existingBooking = await getBookingByConfirmationToken(token)
+  const existingBooking = await getBookingByConfirmationToken(token, { includeTransactionDocument: true })
 
   if (!existingBooking) {
     httpError(404, 'Booking not found')
@@ -25,7 +25,7 @@ export default defineEventHandler(async (event): Promise<CancelBookingConfirmati
   }
 
   return {
-    booking,
+    booking: await getBookingByConfirmationToken(token, { includeTransactionDocument: true }) || booking,
     alreadyPending: false
   }
 })