added comment for payment, changed intent and added amount ui in operations

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

@@ -7,6 +7,7 @@ import 'package:pshared/models/payment/state.dart';
 class Payment {
   final String? paymentRef;
   final String? state;
+  final String? comment;
   final PaymentEndpoint? source;
   final PaymentEndpoint? destination;
   final PaymentOrchestrationState orchestrationState;
@@ -20,6 +21,7 @@ class Payment {
   const Payment({
     required this.paymentRef,
     required this.state,
+    required this.comment,
     required this.source,
     required this.destination,
     required this.orchestrationState,