Remove podcast checklist backend, calendar events and reminder emails; v2.14.3

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

README.md

@@ -141,7 +141,6 @@ siteforge/
 | `POST /api/admin-contact-submissions/:id/reply` | Reply to a submission |
 | `GET /api/admin/qr-codes` | QR code management |
 | `GET /api/admin-episode-scripts/:episodeNumber` | Episode script |
-| `GET /api/admin-podcast-checklist` | Podcast checklist state |
 | `GET /api/admin-subscribers` | Subscriber list |
 
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