feat(i18n): 管理端与玩家端三语支持（中/英/马来语）

- 管理后台 adminT 文案库、结算与代理端页面、表单校验
- 玩家端 vue-i18n 补全首页/公告/串关与 ms 文案
- Element Plus ms 语言包与共享 locale 工具

apps/admin/src/App.vue

@@ -1,7 +1,26 @@
 <script setup lang="ts">
+import { computed } from 'vue';
 import { RouterView } from 'vue-router';
+import { ElConfigProvider } from 'element-plus';
+import zhCn from 'element-plus/es/locale/lang/zh-cn';
+import en from 'element-plus/es/locale/lang/en';
+import ms from 'element-plus/es/locale/lang/ms';
+import { useAdminLocale } from './composables/useAdminLocale';
+
+const { locale } = useAdminLocale();
+
+const elLocale = computed(() => {
+  if (locale.value.startsWith('zh')) return zhCn;
+  if (locale.value.startsWith('ms')) return ms;
+  return en;
+});
 </script>
-<template><RouterView /></template>
+
+<template>
+  <ElConfigProvider :locale="elLocale">
+    <RouterView />
+  </ElConfigProvider>
+</template>
 
 <style>
 *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }