feat: Minstrel no longer talks to Lidarr: its connection, Delete via Lidarr and the unmonitor options are gone, and the track reports are plain quarantine (M502 #5525)

Migration 0091 drops lidarr_config and renames the quarantine tables, types,
indexes and the history column off the Lidarr name. The Integrations Lidarr
card, the Reports "Delete via Lidarr" action, the merge and remove-track
unmonitor options, the Lidarr audit actions and error codes go, on the
server, web and Android. The README describes acquisition as it is now.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/library/duplicate_merge.go

@@ -27,10 +27,8 @@ var ErrSurvivorNotInGroup = errors.New("library: survivor is not a member of the
 
 // MergedCopy is one copy a merge kept or removed.
 type MergedCopy struct {
-	TrackID   pgtype.UUID
-	FilePath  string
-	TrackMbid *string
-	AlbumMbid *string
+	TrackID  pgtype.UUID
+	FilePath string
 }
 
 // MergeResult says what a merge did.
@@ -296,7 +294,7 @@ func splitSurvivor(
 }
 
 func mergedCopyOf(m dbq.ListDuplicateGroupMergeMembersRow) MergedCopy {
-	return MergedCopy{TrackID: m.ID, FilePath: m.FilePath, TrackMbid: m.Mbid, AlbumMbid: m.AlbumMbid}
+	return MergedCopy{TrackID: m.ID, FilePath: m.FilePath}
 }
 
 // mergeChanges collects the sync-log entries a merge owes clients' caches, each