fix 细节调整

Src/Dlhis.Canteen/Order/Services/Implements/MiddleService.cs

@@ -21,6 +21,7 @@ public class MiddleService : IMiddleService
     public async Task<OrderResultResponse> MiddleUploadAsync(BalanceRecordEntity entity)
     {
         entity.Id = 0;
+        entity.Amount = -Math.Abs(entity.Amount);
         if (!await _dbContext.Queryable<BalanceRecordEntity>().AnyAsync(x => x.No == entity.No))
         {
             await _dbContext.InsertAsync(entity);