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/migrations/20260609100000_add_wordpress_enterprise_site_support.down.sql

@@ -0,0 +1,9 @@
+ALTER TABLE enterprise_site_connections
+    DROP CONSTRAINT IF EXISTS ck_enterprise_site_connections_cms_type;
+
+ALTER TABLE enterprise_site_connections
+    ADD CONSTRAINT ck_enterprise_site_connections_cms_type
+        CHECK (cms_type IN ('pbootcms', 'wordpress', 'dedecms', 'phpcms'));
+
+DELETE FROM media_platforms
+WHERE platform_id = 'wordpress';

server/migrations/20260609100000_add_wordpress_enterprise_site_support.up.sql

@@ -0,0 +1,18 @@
+INSERT INTO media_platforms (platform_id, name, category, short_name, accent_color, login_url, logo_url, status, sort_order)
+VALUES ('wordpress', 'WordPress', 'enterprise', 'WP', '#21759b', NULL, NULL, 'active', 901)
+ON CONFLICT (platform_id)
+DO UPDATE SET
+    name = EXCLUDED.name,
+    category = EXCLUDED.category,
+    short_name = EXCLUDED.short_name,
+    accent_color = EXCLUDED.accent_color,
+    status = EXCLUDED.status,
+    sort_order = EXCLUDED.sort_order,
+    updated_at = NOW();
+
+ALTER TABLE enterprise_site_connections
+    DROP CONSTRAINT IF EXISTS ck_enterprise_site_connections_cms_type;
+
+ALTER TABLE enterprise_site_connections
+    ADD CONSTRAINT ck_enterprise_site_connections_cms_type
+        CHECK (cms_type IN ('pbootcms', 'wordpress'));

server/migrations/20260609113000_add_schedule_enterprise_site_targets.down.sql

@@ -0,0 +1,5 @@
+ALTER TABLE schedule_tasks
+    DROP CONSTRAINT IF EXISTS chk_schedule_tasks_publish_enterprise_site_targets_json;
+
+ALTER TABLE schedule_tasks
+    DROP COLUMN IF EXISTS publish_enterprise_site_targets;

server/migrations/20260609113000_add_schedule_enterprise_site_targets.up.sql

@@ -0,0 +1,6 @@
+ALTER TABLE schedule_tasks
+    ADD COLUMN publish_enterprise_site_targets JSONB NOT NULL DEFAULT '[]'::jsonb;
+
+ALTER TABLE schedule_tasks
+    ADD CONSTRAINT chk_schedule_tasks_publish_enterprise_site_targets_json
+        CHECK (jsonb_typeof(publish_enterprise_site_targets) = 'array');