idempotency key delivery fix

frontend/pshared/lib/data/dto/payment/quotes.dart

@@ -9,6 +9,7 @@ part 'quotes.g.dart';
 @JsonSerializable()
 class PaymentQuotesDTO {
   final String quoteRef;
+  final String idempotencyKey;
   final PaymentQuoteAggregateDTO? aggregate;
   final List<PaymentQuoteDTO>? quotes;
 
@@ -16,6 +17,7 @@ class PaymentQuotesDTO {
     required this.quoteRef,
     this.aggregate,
     this.quotes,
+    required this.idempotencyKey,
   });
 
   factory PaymentQuotesDTO.fromJson(Map<String, dynamic> json) => _$PaymentQuotesDTOFromJson(json);