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>

server/internal/tenant/transport/article_handler.go

@@ -66,7 +66,14 @@ func NewArticleHandler(a *bootstrap.App) *ArticleHandler {
 			a.GenerationStreams,
 			a.Config().Generation,
 			a.Config().LLM.MaxOutputTokens,
-		).WithCache(a.Cache).WithLogger(a.Logger).WithConfigProvider(a.ConfigStore),
+		).WithCache(a.Cache).
+			WithLogger(a.Logger).
+			WithConfigProvider(a.ConfigStore).
+			WithEnterpriseSiteService(
+				app.NewEnterpriseSiteService(a.DB, a.ConfigStore).
+					WithCache(a.Cache).
+					WithObjectStorage(a.ObjectStorage),
+			),
 		imitationSvc: app.NewArticleImitationService(
 			a.DB,
 			a.LLM,