task-57(账号/权限页面): 实现菜单删除前置校验

menu-manage-model.ts 增 menuDeleteReason 镜像后端仅删叶子约束(有子先删)；menu-manage-api.ts
增 deleteMenu DELETE /api/admin/permission-menus/{id}；MenusPage 行删除二次确认、
带子节点禁用/拦截并刷新。8 用例全过，419 单测 + build 绿。

admin-frontend-vue/src/pages/account/MenusPage.vue

@@ -1,10 +1,11 @@
 <script setup lang="ts">
 import { computed, onMounted, reactive, ref } from 'vue'
-import { ElMessage } from 'element-plus'
-import { createMenu, loadMenuManageTree, updateMenu } from './menu-manage-api'
+import { ElMessage, ElMessageBox } from 'element-plus'
+import { createMenu, deleteMenu, loadMenuManageTree, updateMenu } from './menu-manage-api'
 import {
   createMenuForm,
   flattenMenuNodes,
+  menuDeleteReason,
   menuFormFromNode,
   menuParentChangeReason,
   nextSiblingSort,
@@ -76,6 +77,24 @@ async function saveMenu() {
   }
 }
 
+async function removeMenu(node: MenuManageNode) {
+  const reason = menuDeleteReason(node)
+  if (reason) {
+    ElMessage.warning(reason)
+    return
+  }
+  try {
+    await ElMessageBox.confirm(`确定删除菜单“${node.name}”吗？`, '删除确认', { type: 'warning' })
+    await deleteMenu(node.id)
+    ElMessage.success('删除成功')
+    await loadMenus()
+  } catch (error) {
+    if (error !== 'cancel' && error !== 'close') {
+      ElMessage.error(error instanceof Error ? error.message : '删除失败')
+    }
+  }
+}
+
 onMounted(loadMenus)
 </script>
 
@@ -94,9 +113,10 @@ onMounted(loadMenus)
         <el-table-column prop="columnKey" label="权限标识" min-width="240" />
         <el-table-column prop="routePath" label="路由" min-width="260" />
         <el-table-column prop="sortOrder" label="排序" width="100" />
-        <el-table-column label="操作" width="140">
+        <el-table-column label="操作" width="200">
           <template #default="{ row }">
             <el-button link type="primary" @click="openEdit(row)">编辑</el-button>
+            <el-button link type="danger" :disabled="menuDeleteReason(row) !== undefined" @click="removeMenu(row)">删除</el-button>
           </template>
         </el-table-column>
       </el-table>