fix(frontend): restore stable element-plus bootstrap to resolve admin crash

admin-frontend/src/App.vue

@@ -1,9 +1,3 @@
-<script setup>
-import zhCn from 'element-plus/es/locale/lang/zh-cn'
-</script>
-
 <template>
-  <el-config-provider :locale="zhCn">
-    <RouterView />
-  </el-config-provider>
+  <RouterView />
 </template>

admin-frontend/src/main.js

@@ -3,7 +3,10 @@ import App from './App.vue'
 
 import router from './router'
 
+import ElementPlus from 'element-plus'
+import zhCn from 'element-plus/es/locale/lang/zh-cn'
+import 'element-plus/dist/index.css'
 
 import './style.css'
 
-createApp(App).use(router).mount('#app')
+createApp(App).use(router).use(ElementPlus, { locale: zhCn }).mount('#app')