fix(#613): 医嘱退回流程完整修复（护士端弹窗 + 医生端展示 + 全链路 6 环）

新 Harness 方法论全链路分析：

📤 发起方（护士端-医嘱校对）：
- ① 前端/页面 ❌ handleCancel 直接调 API → ✅ 改为弹窗要求必填退回原因
- ② Controller ✅ 不涉及（纯转发）
- ③ Service ✅ adviceReject 提取 backReason 传入
- ④ Mapper/DB ✅ backReason 参数已就绪
- ⑤ DB ✅ back_reason 迁移脚本已执行
- ⑥ 关联模块 ✅ ServiceRequest 写入 reasonText

📥 接收方（医生端-临床医嘱）：
- ① 前端/页面 ❌ 无退回原因列 → ✅ 在诊断列前新增橙色退回原因列
- ② Controller ✅ 不涉及
- ③ Service ✅ DTO 新增 reasonText 字段
- ④ Mapper/XML ✅ 5 个 UNION ALL 分支均选取 reason_text
- ⑤ DB ✅ med_medication_request.back_reason 已存在
- ⑥ 展示 ✅ 医生端可看到退回原因

变更：6 文件，+101/-13 行

openhis-ui-vue3/src/views/doctorstation/components/prescription/prescriptionlist.vue

@@ -1345,6 +1345,21 @@
             </span>
           </template>
         </el-table-column>
+        <el-table-column
+          label="退回原因"
+          align="center"
+          prop="reasonText"
+          width="160"
+        >
+          <template #default="scope">
+            <span
+              v-if="!scope.row.isEdit"
+              style="color: #e6a23c;"
+            >
+              {{ scope.row.reasonText || '-' }}
+            </span>
+          </template>
+        </el-table-column>
         <el-table-column
           label="诊断"
           align="center"

openhis-ui-vue3/src/views/inpatientNurse/medicalOrderProofread/components/prescriptionList.vue

@@ -226,6 +226,44 @@
       />
     </div>
   </div>
+  <!-- 退回原因弹窗 -->
+  <el-dialog
+    v-model="backReasonVisible"
+    title="退回原因"
+    width="400px"
+    :close-on-click-modal="false"
+  >
+    <el-form
+      ref="backReasonFormRef"
+      :model="backReasonForm"
+      :rules="backReasonRules"
+    >
+      <el-form-item
+        label="退回原因"
+        prop="reason"
+      >
+        <el-input
+          v-model="backReasonForm.reason"
+          type="textarea"
+          :rows="4"
+          placeholder="请输入退回原因（必填）"
+          maxlength="500"
+          show-word-limit
+        />
+      </el-form-item>
+    </el-form>
+    <template #footer>
+      <el-button @click="backReasonVisible = false">
+        取消
+      </el-button>
+      <el-button
+        type="primary"
+        @click="confirmCancel"
+      >
+        确定退回
+      </el-button>
+    </template>
+  </el-dialog>
 </template>
 <script setup>
 import {ref, computed, getCurrentInstance} from 'vue';
@@ -239,6 +277,9 @@ const prescriptionList = ref([]);
 const deadline = ref(formatDateStr(new Date(), 'YYYY-MM-DD') + ' 23:59:59');
 const type = ref(null);
 const { proxy } = getCurrentInstance();
+const backReasonVisible = ref(false);
+const backReasonForm = ref({ reason: '' });
+const backReasonFormRef = ref(null);
 const loading = ref(false);
 const chooseAll = ref(false);
 const selectionTrigger = ref(0);
@@ -438,24 +479,39 @@ function handleCheck() {
 function handleCancel() {
   let list = getSelectRows();
   if (list.length > 0) {
-    // 校验已发药的医嘱不允许退回
     let dispensedItems = list.filter(item => item.dispenseStatus === 4);
     if (dispensedItems.length > 0) {
       proxy.$message.error('该药品已由药房发放，请先执行退药处理，不可直接退回');
       return;
     }
-    cancel(list).then((res) => {
-      if (res.code == 200) {
-        proxy.$modal.msgSuccess(res.msg);
-        handleGetPrescription();
-      }
-    });
-    console.log(list, 'list');
+    // 显示退回原因弹窗
+    backReasonForm.value.reason = '';
+    backReasonVisible.value = true;
   } else {
     proxy.$message.warning('请先选择医嘱信息');
   }
 }
 
+/** 确定退回 — 从弹窗获取原因后调用API */
+function confirmCancel() {
+  if (!backReasonForm.value.reason.trim()) {
+    proxy.$message.warning('请输入退回原因');
+    return;
+  }
+  let list = getSelectRows();
+  let requestList = list.map(item => ({
+    ...item,
+    backReason: backReasonForm.value.reason.trim()
+  }));
+  cancel(requestList).then((res) => {
+    if (res.code == 200) {
+      proxy.$modal.msgSuccess(res.msg);
+      handleGetPrescription();
+    }
+  });
+  backReasonVisible.value = false;
+}
+
 function getSelectRows() {
   // 获取选中的医嘱信息
   let list = [];