feat(enterprise-site): add WordPress support and scheduled auto-publish to sites

Add WordPress as an enterprise-site CMS type alongside pbootcms, and let
schedule tasks auto-publish generated articles to enterprise sites.

- WordPress connection/publisher service and tests; register wordpress
  media platform and relax cms_type CHECK constraint
- New publish_enterprise_site_targets JSONB column on schedule_tasks with
  array type constraint; thread targets through scheduler dispatch,
  prompt/KOL generation, and worker
- Admin UI: enterprise-site targets in generate/schedule/publish flows,
  KOL package form, MediaView, and i18n strings

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/admin-web/src/App.vue

@@ -12,6 +12,7 @@ import ImageUploadProgressOverlay from '@/components/ImageUploadProgressOverlay.
         colorPrimary: '#1677ff',
         borderRadius: 6,
         colorBgLayout: '#f0f2f5',
+        zIndexPopupBase: 3000,
       },
     }"
   >