chore(dev): release 1.21.0

[github-actions]

🤖 I have created a release beep boop

1.21.0 (2026-01-10)

Features

• Add MDBList Up Next catalog integration (3d86bbf)
• Add TMDB Lists integration (510c17b)
• add TMDB rate limit tracking with x-ratelimit-remaining support (ed40415)
• dashboard: add ability to lock dashboard from public completely (b73933c)
• revamp dash (f552aab)
• revamp Error Management in dashboard (4821f94)
• revamp Error Management in dashboard (a730932)
• revamp Maintenance Tasks, Provider Status & System Health, in dashboard (4bf6c92)

Bug Fixes

• cache: add auto cleanup of old meta cache keys on version change (a2ae76b)
• cache: hash config in cache keys to avoid generating big string (a2ae76b)
• up next: Exclude episodes without air date from Trakt Up Next and exclude MDBList Up Next from catalog warmer (1915305)
• warming: resolve issue with kitsu ids reverting to imdb id (9fe3ddf)

---

This PR was generated with Release Please. See documentation.