Separated request idempotency from intent identity

frontend/pshared/lib/provider/payment/quotation/quotation.dart

@@ -91,12 +91,14 @@ class QuotationProvider extends ChangeNotifier {
     if (!_organizations.isOrganizationSet) throw StateError('Organization is not set');
     _lastIntent = intent;
     try {
+      final intentKey = _buildIntentKey(intent);
       _setResource(_quotation.copyWith(isLoading: true, error: null));
       final response = await QuotationService.getQuotation(
         _organizations.current.id, 
         QuotePaymentRequest(
           idempotencyKey: Uuid().v4(),
           intent: intent.toDTO(),
+          intentKey: intentKey,
         ),
       );
       _isLoaded = true;