style(web): 统一后台图标与全局视觉

src/views/permission/MenuManagementView.vue

@@ -1,7 +1,7 @@
 <!-- Author: fruit.com.cn -->
 
 <script setup>
-import { Plus } from '@element-plus/icons-vue'
+import { AppIcons } from '@/constants/icons'
 import { menuIconNames, useMenuManagement } from '@/views/permission/composables/useMenuManagement'
 import PageHeading from '@/views/components/PageHeading.vue'
 
@@ -12,7 +12,7 @@ const { treeData, loading, form, parentOptions, resetForm, selectNode, saveMenu,
 <template>
   <PageHeading eyebrow="后台管理" title="菜单管理" description="维护系统菜单结构、路由与按钮权限。">
     <el-button type="primary" @click="resetForm(0)">
-      <el-icon><Plus /></el-icon>
+      <AppIcon :icon="AppIcons.add" />
       新增菜单
     </el-button>
   </PageHeading>