feat: 添加语言管理功能，更新系统设置页面，优化用户体验

src/views/system-settings/outlet.vue

@@ -0,0 +1,17 @@
+<script lang="ts" setup></script>
+
+<template>
+  <ion-page>
+    <ion-header>
+      <ion-toolbar class="ui-toolbar">
+        <ion-back-button slot="start" />
+      </ion-toolbar>
+    </ion-header>
+
+    <ion-content :fullscreen="true" class="ion-padding">
+      <ion-router-outlet />
+    </ion-content>
+  </ion-page>
+</template>
+
+<style lang='css' scoped></style>