Added debit settlement amount calculation

frontend/pshared/lib/models/payment/quote/quote.dart

@@ -8,6 +8,7 @@ class PaymentQuote {
   final String? quoteRef;
   final String? idempotencyKey;
   final Money? debitAmount;
+  final Money? debitSettlementAmount;
   final Money? expectedSettlementAmount;
   final Money? expectedFeeTotal;
   final List<FeeLine>? feeLines;
@@ -18,6 +19,7 @@ class PaymentQuote {
     required this.quoteRef,
     required this.idempotencyKey,
     required this.debitAmount,
+    required this.debitSettlementAmount,
     required this.expectedSettlementAmount,
     required this.expectedFeeTotal,
     required this.feeLines,