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.

tests/deployment_scoping.bats

@@ -133,6 +133,16 @@ REMOTE_DEPLOY="$REPO_ROOT/scripts/deploy-remote.sh"
     [ -z "$output" ]
 }
 
+@test "a compose edit never restarts a Quadlet-owned media server" {
+    # dankserver/compose.yaml is an inventory; the media servers' Quadlets own
+    # their containers. A compose edit that restarted them would cut real viewers
+    # for a change that cannot affect them.
+    run python3 "$PLANNER" --target dankserver --paths dankserver/compose.yaml
+    [ "$status" -eq 0 ]
+    ! printf '%s\n' "$output" | grep -qx jellyfin
+    ! printf '%s\n' "$output" | grep -qx plex
+}
+
 @test "compose planner narrows a compose edit to the changed service" {
     local base head
     base=$(git -C "$REPO_ROOT" rev-parse HEAD)