feat: the library's albums go on the wanted list as held, once; after that the list is the truth (M502 #5567)

A one-time job in the wanted worker lists every album in the library as a
held want, one per release group, with a record that it happened
(acquisition_settings.library_listed_at). Albums whose tags name only a
release are named on MusicBrainz first, 120 a pass; what nothing names is
counted and shown on the Held tab.

Re-acquisition now wants back only albums on the list. Taking a held album
off the list leaves its files, and it is never fetched back; albums put in
the library folder by hand afterwards are not added.

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

internal/db/queries/reacquisition.sql

@@ -23,6 +23,8 @@ RETURNING *;
 --     re-stamps (#2523), so it is a genuine "gone since" clock;
 --   * MusicBrainz can name it: the album and its artist have MBIDs. Albums
 --     failing this are counted separately (CountAlbumsMissingWithoutMbid);
+--   * it is on the wanted list (#5567): an album taken off the list, or
+--     dropped into the library by hand, is not fetched back;
 --   * no want already covers it: none open, and none held since its files
 --     went missing. A want held after the loss means the library has a full
 --     copy despite the missing rows (#5245), so asking again would loop.
@@ -43,7 +45,10 @@ SELECT albums.id                 AS album_id,
    AND artists.mbid IS NOT NULL
  GROUP BY albums.id, albums.title, albums.mbid, albums.release_group_mbid,
           artists.name, artists.mbid
-HAVING NOT EXISTS (
+HAVING EXISTS (
+       SELECT 1 FROM wants w
+        WHERE w.album_id = albums.id OR w.release_group_mbid = albums.release_group_mbid)
+   AND NOT EXISTS (
        SELECT 1 FROM wants w
         WHERE (w.album_id = albums.id OR w.release_group_mbid = albums.release_group_mbid)
           AND (w.fulfilled_at IS NULL OR w.fulfilled_at > MAX(tracks.missing_since)))