Complete the Post CRUD that was previously stub-only:
- PostModel (AdminModel) for loading/saving individual posts
- Post HtmlView with toolbar (apply, save, cancel, dashboard)
- post.xml form with article selector, service selector, message
textarea, status dropdown, and scheduled_at calendar picker
- Post edit template with results sidebar and re-queue button
- Posts list: New button in toolbar, clickable article titles,
scheduled_at display with clock icon
- 20 new language strings for the post edit UI
Authored-by: Moko Consulting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>