fix 券唯一码生成逻辑调整

Src/Dlhis.Canteen/Voucher/Services/Implements/BirthdayVoucherService.cs

@@ -77,7 +77,7 @@ public class BirthdayVoucherService : BaseVoucherService, IVoucherService
         //生日券金额固定100元
         const decimal amount = 100;
 
-        var dayStr = year + "-" + gainfo.Birthday.Value.ToString("MM-dd");
+        var dayStr = year.ToString();//按年区分,避免生日日期变更重复发放
         //由数据类型+工号+生日组成唯一标识
         var no = GenerateUniqueCode(VoucherEnumType.Birthday.ToString() + gainfo.Code + dayStr);