fix: 多条退款detail合并为单条

src/main/java/com/chaozhanggui/system/cashierservice/service/OrderService.java

@@ -284,7 +284,7 @@ public class OrderService {
         });
 
         // 根据placeNum进行分组
-        Map<Integer, List<TbOrderDetail>> groupedByPlaceNum = list.stream()
+        Map<Integer, List<TbOrderDetail>> groupedByPlaceNum = detailHashMap.values().stream()
                 .collect(Collectors.groupingBy(TbOrderDetail::getPlaceNum));
 
         ArrayList<HashMap<String, Object>> dataList = new ArrayList<>();