Add Admin Fonts settings page to install CJK font packages

Adds AdminFontView with package list, install buttons, status indicators and toast notifications backed by /api/v1/fonts/status and /api/v1/fonts/{package}/install. Wires the new admin.settings.fonts lazy route and a Languages-icon menu entry under Admin → Settings.

resources/scripts-v2/features/admin/views/AdminSettingsView.vue

@@ -88,6 +88,11 @@ const menuItems = computed<SettingsMenuItem[]>(() => [
     link: '/admin/administration/settings/file-disk',
     icon: 'FolderIcon',
   },
+  {
+    title: t('settings.menu_title.fonts'),
+    link: '/admin/administration/settings/fonts',
+    icon: 'LanguageIcon',
+  },
   {
     title: t('settings.menu_title.update_app'),
     link: '/admin/administration/settings/update-app',