feat: video rips and stray copies handle themselves (M498 #5439)

- The resolver also merges cross-release and mismatch groups where Lidarr
  maps exactly one copy: the others fulfil nothing, so removing them opens no
  hole (D-a rule 1). That covers a rip beside the clean copy on another
  release and a wrong-file import Lidarr holds unmapped. With two or more
  mapped copies each fulfils its own release and nothing is removed.
- A track whose file name carries a video-rip marker is held back from radio
  and the system mixes (tracks.source_verdict, migration 0077). It still plays
  when chosen. A renamed file is released; the operator's "fine" sticks.
- Suspect sources shows what was done to each track, with "This one is fine"
  and "Hold back again" (PUT /api/admin/library/suspect-sources/{id}).
- The Liked list prefers a copy that is not held back.

Replacing a rip that has no clean copy is left for the operator to decide.

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

internal/playlists/system.go

@@ -1101,7 +1101,9 @@ func insertSystemPlaylist(ctx context.Context, qtx *dbq.Queries, userID pgtype.U
 }
 
 // oneCopyPerSong keeps the first of a song's copies on different releases
-// (M498 #5438): a mix holds the song once, in its best-ranked place.
+// (M498 #5438): a mix holds the song once, in its best-ranked place. A video
+// rip held back from the mixes (#5439) is left out, and a clean copy of the
+// same song can take its place.
 func oneCopyPerSong(ctx context.Context, qtx *dbq.Queries, tracks []rankedCandidate) ([]rankedCandidate, error) {
 	ids := make([]pgtype.UUID, len(tracks))
 	for i, t := range tracks {
@@ -1111,14 +1113,18 @@ func oneCopyPerSong(ctx context.Context, qtx *dbq.Queries, tracks []rankedCandid
 	if err != nil {
 		return nil, fmt.Errorf("song keys: %w", err)
 	}
-	songOf := make(map[pgtype.UUID]pgtype.UUID, len(rows))
+	songOf := make(map[pgtype.UUID]dbq.ListTrackSongKeysRow, len(rows))
 	for _, r := range rows {
-		songOf[r.ID] = r.SongKey
+		songOf[r.ID] = r
 	}
 	seen := make(map[pgtype.UUID]bool, len(tracks))
 	out := tracks[:0:0]
 	for _, t := range tracks {
-		song, ok := songOf[t.TrackID]
+		row, ok := songOf[t.TrackID]
+		if ok && row.HeldBack {
+			continue
+		}
+		song := row.SongKey
 		if ok && seen[song] {
 			continue
 		}