docs(dankserver): document Plex (native systemd) and Tautulli (snap) as they actually run

Live-verified 2026-08-29: plexmediaserver.service is an enabled native
systemd unit on Dankserver (not a quadlet; updates via apt, not deploy.sh),
and tautulli runs as a snap with no auth wall on 0.0.0.0:8181. The hunt list
named both; neither had a page. Index linked per the docs-completeness seam.

serverAppConfigs-docs/index.md

@@ -49,6 +49,8 @@ covers both workloads).
 - [[readarr]] — ebook/audiobook management
 - [[prowlarr]] — indexer management
 - [[qbittorrent]] — torrent download client
+- [[Plex]] — native systemd media server on Dankserver (not a container)
+- [[Tautulli]] — Plex statistics and notifications, snap-packaged
 - [[mariadb]] — RomM database backend
 - [[redis]] — RomM cache/queue backend