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/layouts/ManageLayout.vue

@@ -2,29 +2,32 @@
 import { computed } from 'vue';
 import { RouterView, RouterLink, useRoute, useRouter } from 'vue-router';
 import { useAuthStore } from '../stores/auth';
+import { useAdminLocale } from '../composables/useAdminLocale';
+import AdminLocaleSwitcher from '../components/AdminLocaleSwitcher.vue';
 
 const route = useRoute();
 const router = useRouter();
 const auth = useAuthStore();
+const { t } = useAdminLocale();
 
-const adminMenus = [
-  { path: '/',          label: '控制台'  },
-  { path: '/users',     label: '玩家管理' },
-  { path: '/agents',    label: '代理管理' },
-  { path: '/matches',   label: '赛事管理' },
-  { path: '/bets',      label: '注单管理' },
-  { path: '/cashback',  label: '返水管理' },
-  { path: '/audit',     label: '操作日志' },
-];
+const adminMenus = computed(() => [
+  { path: '/', label: t('nav.dashboard') },
+  { path: '/users', label: t('nav.users') },
+  { path: '/agents', label: t('nav.agents') },
+  { path: '/matches', label: t('nav.matches') },
+  { path: '/bets', label: t('nav.bets') },
+  { path: '/cashback', label: t('nav.cashback') },
+  { path: '/audit', label: t('nav.audit') },
+]);
 
-const agentMenus = [
-  { path: '/',            label: '概览'   },
-  { path: '/my-players',  label: '直属玩家' },
-  { path: '/sub-agents',  label: '下级代理' },
-  { path: '/my-bets',     label: '注单查询' },
-];
+const agentMenus = computed(() => [
+  { path: '/', label: t('nav.dashboard') },
+  { path: '/my-players', label: t('nav.players') },
+  { path: '/sub-agents', label: t('nav.subAgents') },
+  { path: '/my-bets', label: t('nav.myBets') },
+]);
 
-const menus = computed(() => (auth.isAdmin.value ? adminMenus : agentMenus));
+const menus = computed(() => (auth.isAdmin.value ? adminMenus.value : agentMenus.value));
 
 const currentLabel = computed(() =>
   menus.value.find(m => m.path === route.path)?.label ?? ''
@@ -72,11 +75,12 @@ function logout() {
             <div class="avatar">{{ userInitial }}</div>
             <div class="user-info">
               <span class="user-name">{{ auth.user?.username }}</span>
-              <span class="user-role">{{ auth.isAdmin ? '系统管理员' : '代理账号' }}</span>
+              <span class="user-role">{{ auth.isAdmin ? t('role.admin') : t('role.agent') }}</span>
             </div>
           </div>
-          <div class="portal-tag">{{ auth.portalLabel }}</div>
-          <button class="btn-logout" @click="logout">退出</button>
+          <AdminLocaleSwitcher />
+          <div class="portal-tag">{{ auth.isAdmin ? t('portal.admin') : t('portal.agent') }}</div>
+          <button class="btn-logout" @click="logout">{{ t('logout') }}</button>
         </div>
       </header>
       <main class="page-main">