Jellyseerr was rebranded upstream to Seerr (seerr-team/seerr), and
nixpkgs now aliases services.jellyseerr to services.seerr with an
identical state directory, so this is a same-data rename. Also fixes
systemd.services.jellyseerr.after, which was a silent no-op since the
underlying unit has always been named seerr.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019MLWL7mWHCV6UGfzmhnfqN