feat(admin): admin 独立入口安装 i18n

apiMain / customToolsMain / customToolsGuideMain / main / policyMain
五个 admin 独立入口统一 installI18n，使管理后台页面接入前端多语言体系。

（存量改动随安全修复一同入库，与安全审计无关）

Co-authored-by: Astrion powered by Kimi-K3 <astrion-agent@users.noreply.github.com>

static/src/admin/apiMain.ts

@@ -1,4 +1,7 @@
 import { createApp } from 'vue';
+import { installI18n } from '@/locales';
 import ApiAdminApp from './ApiAdminApp.vue';
 
-createApp(ApiAdminApp).mount('#admin-api-app');
+const app = createApp(ApiAdminApp);
+installI18n(app);
+app.mount('#admin-api-app');

static/src/admin/customToolsGuideMain.ts

@@ -1,4 +1,7 @@
 import { createApp } from 'vue';
+import { installI18n } from '@/locales';
 import CustomToolsGuideApp from './CustomToolsGuideApp.vue';
 
-createApp(CustomToolsGuideApp).mount('#custom-tools-guide');
+const app = createApp(CustomToolsGuideApp);
+installI18n(app);
+app.mount('#custom-tools-guide');

static/src/admin/customToolsMain.ts

@@ -1,4 +1,7 @@
 import { createApp } from 'vue';
+import { installI18n } from '@/locales';
 import CustomToolsApp from './CustomToolsApp.vue';
 
-createApp(CustomToolsApp).mount('#custom-tools-app');
+const app = createApp(CustomToolsApp);
+installI18n(app);
+app.mount('#custom-tools-app');

static/src/admin/main.ts

@@ -1,4 +1,7 @@
 import { createApp } from 'vue';
+import { installI18n } from '@/locales';
 import AdminDashboardApp from './AdminDashboardApp.vue';
 
-createApp(AdminDashboardApp).mount('#admin-app');
+const app = createApp(AdminDashboardApp);
+installI18n(app);
+app.mount('#admin-app');

static/src/admin/policyMain.ts

@@ -1,4 +1,7 @@
 import { createApp } from 'vue';
+import { installI18n } from '@/locales';
 import PolicyApp from './PolicyApp.vue';
 
-createApp(PolicyApp).mount('#admin-policy-app');
+const app = createApp(PolicyApp);
+installI18n(app);
+app.mount('#admin-policy-app');