refactor(tenant-toggle): 使用getPopupContainer替代固定样式

移除Select组件的固定定位样式，改用getPopupContainer方法统一管理弹出层容器

apps/web-antd/src/components/tenant-toggle/src/index.vue

@@ -10,6 +10,7 @@ import { useRoute } from 'vue-router';
 import { useAccess } from '@vben/access';
 import { useTabs } from '@vben/hooks';
 import { $t } from '@vben/locales';
+import { getPopupContainer } from '@vben/utils';
 
 import { message, Select, Spin } from 'antdv-next';
 import { storeToRefs } from 'pinia';
@@ -143,9 +144,7 @@ function filterOption(input: string, option: TenantOption) {
       :filter-option="filterOption"
       :options="tenantList"
       :placeholder="$t('component.tenantToggle.placeholder')"
-      :styles="{
-        root: { position: 'fixed', zIndex: 1024 },
-      }"
+      :get-popup-container="getPopupContainer"
       allow-clear
       class="w-60"
       show-search