fix(#613): 请修复 Bug #613：【医嘱校对/住院医生工作站】医嘱退回流程缺失反馈机制：护士端退回无原因录入，医生端缺失原因显示

根因：
- 1. ❌ 录入（护士端无退回原因输入弹窗）
- 2. ❌ 保存（后端不保存退回原因）
- 3. ❌ 查询（Mapper XML 不查询退回原因字段）
- 4. ❌ 展示（医生端不显示退回原因）
- 5. ❌ ServiceRequest 已有 `reasonText` 字段但未使用
- 6. ❌ MedicationRequest 无退回原因字段

修复：
- Step 1**: 添加 `backReason` 到后端 DTO

openhis-server-new/openhis-application/src/main/java/com/openhis/web/common/dto/PerformInfoDto.java

@@ -36,4 +36,7 @@ public class PerformInfoDto {
     /** 分组id */
     @JsonSerialize(using = ToStringSerializer.class)
     private Long groupId;
+
+    /** 退回原因 */
+    private String backReason;
 }

openhis-server-new/openhis-domain/src/main/java/com/openhis/medication/domain/MedicationRequest.java

@@ -111,6 +111,9 @@ public class MedicationRequest extends HisBaseEntity {
     /** 支持用药信息 */
     private String supportInfo;
 
+    /** 退回原因 */
+    private String backReason;
+
     /** 请求开始时间 */
     private Date reqAuthoredTime;
 

openhis-server-new/openhis-domain/src/main/java/com/openhis/medication/service/IMedicationRequestService.java

@@ -30,7 +30,7 @@ public interface IMedicationRequestService extends IService<MedicationRequest> {
      * @param practitionerId 校对人
      * @param checkDate 校对时间
      */
-    void updateDraftStatusBatch(List<Long> requestIdList, Long practitionerId, Date checkDate);
+    void updateDraftStatusBatch(List<Long> requestIdList, Long practitionerId, Date checkDate, String backReason);
 
     /**
      * 更新请求状态：取消

openhis-server-new/openhis-domain/src/main/java/com/openhis/medication/service/impl/MedicationRequestServiceImpl.java

@@ -44,7 +44,7 @@ public class MedicationRequestServiceImpl extends ServiceImpl<MedicationRequestM
      * @param checkDate 校对时间
      */
     @Override
-    public void updateDraftStatusBatch(List<Long> requestIdList, Long practitionerId, Date checkDate) {
+    public void updateDraftStatusBatch(List<Long> requestIdList, Long practitionerId, Date checkDate, String backReason) {
         LambdaUpdateWrapper<MedicationRequest> updateWrapper =
             new LambdaUpdateWrapper<MedicationRequest>().in(MedicationRequest::getId, requestIdList)
                 .set(MedicationRequest::getStatusEnum, RequestStatus.DRAFT.getValue());
@@ -54,6 +54,9 @@ public class MedicationRequestServiceImpl extends ServiceImpl<MedicationRequestM
         if (checkDate != null) {
             updateWrapper.set(MedicationRequest::getCheckTime, checkDate);
         }
+        if (backReason != null) {
+            updateWrapper.set(MedicationRequest::getBackReason, backReason);
+        }
         baseMapper.update(null, updateWrapper);
     }
 
@@ -75,6 +78,9 @@ public class MedicationRequestServiceImpl extends ServiceImpl<MedicationRequestM
         if (checkDate != null) {
             updateWrapper.set(MedicationRequest::getCheckTime, checkDate);
         }
+        if (backReason != null) {
+            updateWrapper.set(MedicationRequest::getBackReason, backReason);
+        }
         baseMapper.update(null, updateWrapper);
     }
 

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

@@ -109,7 +109,7 @@ public interface IServiceRequestService extends IService<ServiceRequest> {
      * @param practitionerId 校对人
      * @param checkDate 校对时间
      */
-    void updateDraftStatus(List<Long> serviceRequestIdList, Long practitionerId, Date checkDate);
+    void updateDraftStatus(List<Long> serviceRequestIdList, Long practitionerId, Date checkDate, String backReason);
 
     /**
      * 更新服务状态：待发送