fix(#613): 补充 DB 迁移 + ServiceRequest 实际写入退回原因

问题：
- med_medication_request 表无 back_reason 列 → Entity 和 Service 写了但 DB 报错
- ServiceRequestServiceImpl.updateDraftStatus 接收 backReason 参数但不使用

修复：
- 新增迁移脚本 sql/迁移记录-DB变更记录/20260529_fix_BUG#613_add_column_back_reason.sql
- 4 个 schema (histest1/histest/hisdev/hisprd) 已执行 ALTER TABLE ADD COLUMN
- ServiceRequestServiceImpl.updateDraftStatus: 新增 setReasonText(backReason)

openhis-server-new/openhis-domain/src/main/java/com/openhis/workflow/service/impl/ServiceRequestServiceImpl.java

@@ -198,8 +198,14 @@ public class ServiceRequestServiceImpl extends ServiceImpl<ServiceRequestMapper,
      */
     @Override
     public void updateDraftStatus(List<Long> serviceRequestIdList, Long practitionerId, Date checkDate, String backReason) {
-        baseMapper.update(new ServiceRequest().setStatusEnum(RequestStatus.DRAFT.getValue())
-                .setPerformerCheckId(SecurityUtils.getLoginUser().getPractitionerId()).setCheckTime(DateUtils.getNowDate()),
+        ServiceRequest updateEntity = new ServiceRequest()
+                .setStatusEnum(RequestStatus.DRAFT.getValue())
+                .setPerformerCheckId(SecurityUtils.getLoginUser().getPractitionerId())
+                .setCheckTime(DateUtils.getNowDate());
+        if (backReason != null && !backReason.isEmpty()) {
+            updateEntity.setReasonText(backReason);
+        }
+        baseMapper.update(updateEntity,
                 new LambdaUpdateWrapper<ServiceRequest>().in(ServiceRequest::getId, serviceRequestIdList)
                         .eq(ServiceRequest::getDeleteFlag, DelFlag.NO.getCode()));
     }