feat: OrderEventListener에서 할인 금액 파라미터 추가

Author: rnqhstmd

apps/commerce-api/src/main/java/com/loopers/interfaces/api/listener/OrderEventListener.java

@@ -67,7 +67,7 @@ public void handleDataPlatformSend(OrderCreatedEvent event) {
                     event.orderId(),
                     event.userId(),
                     event.totalAmount(),
-                    0L,
+                    event.discountAmount(),
                     items
             );