Adds sync_db_from_wordpress() that treats WordPress as source of truth:
- future posts: update scheduled_publish_at to WP's actual date
- draft posts: clear scheduled_publish_at (not yet scheduled)
- published posts: mark article as 'published' in DB
- trashed/deleted posts: clear wp_post_id + wp_post_url + slot so article
can be re-processed
Exposed via POST /admin/wp-sync with a sync button on the schedule page.
Run after any manual rescheduling in WordPress to bring DB back in sync.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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