优化分类树加载逻辑，新增批量查询子节点接口以减少数据库往返，提升性能。重构相关服务和控制器，确保系统的可维护性和扩展性。

jeecgboot-vue3/src/views/mes/material/MesMixerMaterialList.vue

@@ -114,6 +114,8 @@ const { tableContext, onExportXls, onImportXls } = useListPage({
     title: '密炼物料信息',
     api: list,
     columns,
+    // 避免：表格默认 immediate 请求一次 + onMounted 末尾 reload 再请求一次（进入页列表闪两次）
+    immediate: false,
     canResize: true,
     formConfig: { labelWidth: 120, schemas: searchFormSchema, autoSubmitOnEnter: true, showAdvancedButton: true },
     actionColumn: { width: 120 },
@@ -227,9 +229,8 @@ function findNodeByKey(nodes: Recordable[], key: string): Recordable | null {
 async function loadCategoryTree() {
   treeLoading.value = true;
   try {
-    const root = await fetchMaterialCategoryRoot();
+    const [root, res] = await Promise.all([fetchMaterialCategoryRoot(), loadCategoryTreeRoot({ async: false, pcode: 'XSLMES_MATERIAL' })]);
     materialCategoryRootId.value = root?.id != null ? String(root.id) : '';
-    const res = await loadCategoryTreeRoot({ async: false, pcode: 'XSLMES_MATERIAL' });
     rawCategoryTree.value = Array.isArray(res) ? res : [];
     if (!materialCategoryRootId.value || !rawCategoryTree.value.length) {
       createMessage.warning('未加载到物料分类树，请确认分类字典根编码 XSLMES_MATERIAL 已存在。');