fix: 隐藏新增工单附件上传空白列表

- 为新增工单附件上传组件增加局部样式类
- 隐藏 FileUpload 内部 upload-list-card 占位
- 避免上传附件后出现多余空白卡片

src/views/pms/iotmainworkorder/IotMainWorkOrderAdd.vue

@@ -73,6 +73,7 @@
           <el-col :span="8">
             <el-form-item label="附件">
               <FileUpload
+                class="work-order-attachment-upload"
                 :device-id="undefined"
                 :show-folder-button="false"
                 @upload-success="handleUploadSuccess" />
@@ -1221,6 +1222,10 @@ const handleDelete = async (str: string) => {
   width: 100%;
 }
 
+.work-order-attachment-upload :deep(.upload-list-card) {
+  display: none;
+}
+
 .attachment-list {
   width: 100%;
   padding: 10px;