fix: 修复采购申请列表更新材料功能无响应的问题

- 添加缺失的 handleUpdateFiles 函数，调用 UpdateFilesDialog 弹窗

src/views/purchase/purchasingrequisition/index.vue

@@ -708,6 +708,16 @@ const handleMoreCommand = (command: string, row: any) => {
   }
 };
 
+/** 更新材料 */
+const handleUpdateFiles = (row: any) => {
+  const id = row?.id ?? row?.purchaseId;
+  if (!id) {
+    useMessage().warning('无法获取采购申请ID');
+    return;
+  }
+  updateFilesDialogRef.value?.open(id, row.purchaseNo);
+};
+
 /** 下载审批表 */
 const handleDownloadApply = (row: any) => {
   const id = row?.id ?? row?.purchaseId;