* fix(jellyfin): clean up Jellyfin sessions on Jellyseerr logout
* refactor(auth): remove deleteUserDevice method and handle device deletion directly in logout process
* refactor(auth): optimize logout route for Jellyfin/Emby
Only query database for Jellyfin/Emby users during logout to avoid unnecessary database queries for Plex/local users. This improves performance by skipping the device deletion process when it's not needed.