chore(media): retire the legacy Jellyfin block from dankserver/compose.yaml

The container has had one owner since the Quadlet cutover
(dankserver/jellyfin/quadlet/jellyfin.container). The block was a second owner,
and wrong on every path: jellyfin/jellyfin:latest instead of the pinned ghcr
image, /opt/jellyfin/* data roots that no longer exist, and a read-only
/mnt/entropy:/data bind that the metadata view has since replaced.

The planner no longer counts jellyfin as a compose service, so editing the
inventory cannot restart a media server; tests/deployment_scoping.bats pins that
contract for both jellyfin and plex.

dankserver/compose.yaml

@@ -94,34 +94,12 @@ services:
       timeout: 10s
       retries: 3
 
-  # ═══════════════════════════════════════════════
-  # Jellyfin — media server (movies, TV, music)
-  # ═══════════════════════════════════════════════
-  jellyfin:
-    image: jellyfin/jellyfin:latest
-    container_name: jellyfin
-    restart: unless-stopped
-    ports:
-      - "8096:8096/tcp"
-      - "8920:8920/tcp"
-      - "7359:7359/udp"
-      - "1900:1900/udp"
-    environment:
-      - JELLYFIN_PublishedServerUrl=http://192.168.0.235:8096
-      - DOTNET_SYSTEM_IO_DISABLEFILELOCKING=true
-    volumes:
-      - /opt/jellyfin/config:/config
-      - /opt/jellyfin/cache:/cache
-      - /mnt/entropy:/data:ro
-    devices:
-      - /dev/dri:/dev/dri
-    group_add:
-      - "992"
-    healthcheck:
-      test: ["CMD", "curl", "-f", "http://localhost:8096/health"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
+  # Jellyfin left this file when it became a Quadlet: the container is owned by
+  # dankserver/jellyfin/quadlet/jellyfin.container, its data roots are under
+  # /home/dank/Containers/jellyfin, and its library arrives through the SSD
+  # overlay at /var/lib/media-meta/view (scripts/media-view.sh). The block that
+  # was here named /opt/jellyfin/* and a read-only array bind — a second owner for
+  # the container name `jellyfin`, wrong on every path. One owner per container.
 
   # ═══════════════════════════════════════════════
   # Calibre-Web — e-book web frontend