feat(stocking): 编辑备货单支持车辆附件上传与回显

明细行备注下方增加附件上传（同新建页），进入编辑时经
populateFromDetail 回显已有附件，可增可删。

Co-Authored-By: Claude <noreply@anthropic.com>

src/views/crmpc/stocking/stocking_edit.vue

@@ -577,6 +577,37 @@
               </ElFormItem>
             </ElCol>
           </ElRow>
+          <ElRow :gutter="12" class="item-row-wrap">
+            <ElCol :sm="24" :md="24" :lg="24" :xl="24">
+              <ElFormItem label="附件" label-width="95px">
+                <el-upload
+                  :action="itemUploadAction"
+                  :headers="uploadHeaders"
+                  :show-file-list="false"
+                  :before-upload="beforeItemAttachmentUpload"
+                  :on-success="(res: any) => handleItemAttachmentUpload(res, idx)"
+                  multiple
+                  accept=".jpg,.jpeg,.png,.gif,.pdf,.doc,.docx,.xls,.xlsx,.txt"
+                >
+                  <el-button size="small" type="primary" plain>上传附件</el-button>
+                </el-upload>
+                <div
+                  v-if="item.attachment_files && item.attachment_files.length"
+                  style="margin-top: 4px"
+                >
+                  <el-tag
+                    v-for="(f, fIdx) in item.attachment_files"
+                    :key="fIdx"
+                    closable
+                    @close="removeItemAttachment(idx, fIdx)"
+                    style="margin: 2px 4px 2px 0"
+                  >
+                    {{ f.name }}
+                  </el-tag>
+                </div>
+              </ElFormItem>
+            </ElCol>
+          </ElRow>
           <ElRow :gutter="12">
             <ElCol :span="24" style="text-align: right">
               <el-tag effect="light" class="row-actions" type="success" @click="copyRow(idx)"> 复制 </el-tag>
@@ -1208,7 +1239,13 @@
     getVehicleList,
     handleVehicleSizeChange,
     handleVehicleCurrentChange,
-    chooseVehicle
+    chooseVehicle,
+
+    // 车辆附件上传（uploadHeaders 页面已解构，复用）
+    itemUploadAction,
+    beforeItemAttachmentUpload,
+    handleItemAttachmentUpload,
+    removeItemAttachment
   } = useStockingForm(false, stocking_id as string) // isFinal = true, stocking_id
 
   // 获取详情数据