Sonarr, Radarr, qBittorrent, Jellyfin, and Bazarr all need to create
files that are writable by the media group. Without this, Jellyfin
can't write thumbnails/artwork to media directories and services
can't collaborate on shared files. Also fixes radarr movies directory
to use setgid (2775) consistently.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
