chore: release 2.21.0

[Viren070]

🤖 I have created a release beep boop

2.21.0 (2026-01-07)

Features

• builtins/seadex: add addon (fe6ce9d)

Bug Fixes

• adjust poster service option (616838a)
• allow 'removing' presets, handle disabled presets explicitly., handle initialisation errors in catalog route (e8c961a)
• builtins/seadex: add torrent sources for Nyaa (83259b7)
• builtins: pass release group through (f1e3096)
• filter out top poster api key (4ebf159)
• fix digital release (#600) (de956de)
• handle sub client redis errors (2fee58d)
• make domain user agent env var consistent (80a244b)
• parser/regex: handle optional 'a' after ddp for audio channel patterns (#601) (60ca210)
• pass folder size in builtins, add folderName support (e2b9a19)
• presets/comet: update logo url (438b0cd)
• presets/debridio-ic4a: mark preset as removed (65cfcf6)
• templates: Apply migrations before parsing the config (#604) (21fec28)
• update default zilean URL (67f9062)
• use logical OR for public webdav URL fallback (1dd01c4)

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