feat: duplicates resolve themselves without Lidarr (M502 #5517)

Lidarr is off, and with it the resolver had stopped merging: it only
merged when Lidarr had said which copies it mapped. Minstrel is now the
only program writing the library, so the rule is about the copies:

- A song held twice on one album: the extra copies merge into the one
  whose tags fit best (then lossless, larger, older).
- Across releases or under another title: when every copy but one is a
  video rip (held back, or named like one and not marked fine), the rips
  merge into the one that is not.
- Clean copies on different releases are linked as one song, as before.
- Anything else waits for the operator.

Gone with Lidarr: release switches and their settle window, the
unmapped-file read, the rip search, the merge guard and its 409/503,
lidarr.Client's release methods, and duplicate_group_members.lidarr_state
(migration 0078). The duplicates page drops the per-copy Lidarr badge
and the blocked-merge notice; past release changes stay in its history.

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

internal/db/queries/tracks.sql

@@ -334,40 +334,3 @@ UPDATE tracks
    SET source_verdict = sqlc.arg(verdict)::text, source_verdict_at = now()
  WHERE id = sqlc.arg(id)
    AND source_verdict IS NOT NULL;
-
--- name: ListAlbumsWithSoleCopyRips :many
--- Albums holding a held-back video rip that is the only copy of its song
--- (#5447): no present copy that is not a rip shares its song, and no pending
--- duplicate group pairs it with one. Lidarr counts such a track fulfilled, so
--- the resolver asks it to search the album for a better release. Albums
--- searched within the last week are left out, most rips first.
-SELECT a.id                  AS album_id,
-       a.release_group_mbid::text AS release_group_mbid,
-       a.title               AS album_title,
-       ar.name               AS artist_name,
-       count(*)::bigint      AS rips
-  FROM tracks t
-  JOIN albums  a  ON a.id  = t.album_id
-  JOIN artists ar ON ar.id = a.artist_id
- WHERE t.source_verdict = 'suspect'
-   AND t.missing_since IS NULL
-   AND a.release_group_mbid IS NOT NULL
-   AND NOT EXISTS (
-       SELECT 1 FROM tracks c
-        WHERE c.song_key = t.song_key AND c.id <> t.id
-          AND c.missing_since IS NULL AND c.source_verdict IS DISTINCT FROM 'suspect')
-   AND NOT EXISTS (
-       SELECT 1 FROM duplicate_group_members m
-         JOIN duplicate_groups g ON g.id = m.group_id AND g.status = 'pending'
-         JOIN duplicate_group_members m2 ON m2.group_id = g.id AND m2.track_id <> t.id
-         JOIN tracks c ON c.id = m2.track_id
-        WHERE m.track_id = t.id
-          AND c.missing_since IS NULL AND c.source_verdict IS DISTINCT FROM 'suspect')
-   AND NOT EXISTS (
-       SELECT 1 FROM audit_log l
-        WHERE l.action = 'lidarr_rip_search'
-          AND l.metadata->>'album_id' = a.id::text
-          AND l.created_at > now() - interval '7 days')
- GROUP BY a.id, a.release_group_mbid, a.title, ar.name
- ORDER BY count(*) DESC, a.id
- LIMIT sqlc.arg(page_limit);