feat: a held album below the quality you settle for, or holding a video rip, stays wanted for a better copy, and the import replaces the old tracks with their likes and plays carried over (M502 #5524)

- acquisition_settings.upgrade_until (default High quality lossy, Lidarr's
  cutoff, note #5527; "" is off), an "Upgrade until" row under Searching.
- The wanted worker judges held albums hourly: tier per format from size per
  second (the scanner records no bitrate), the album's worst. Below the
  cutoff it is wanted for quality; a video rip among its tracks always.
- The schedule searches upgrades weekly, after open wants; a release no
  better than the copy held is refused ("not_better").
- The import matches each file to the track it would replace (recording,
  then disc/track) and replaces it when it is a rip or the file is a better
  tier: over the same path in one rename, or filed beside it and the old
  track folded in (library.ReplaceTrack: file first, then foldTrackInto).
  Nothing better: the release is set aside.
- Collection › Upgrades (Lidarr's Cutoff Unmet); Suspect sources says when a
  clean copy was looked for instead of Lidarr's search.

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

cmd/minstrel/main.go

@@ -340,7 +340,9 @@ func run() error {
 	if acoustIDSettings != nil {
 		printer = &importer.AcoustIDPrinter{Settings: acoustIDSettings, Client: acoustIDClient}
 	}
-	go importer.New(pool, scanner, cat, printer, cfg.Library.ScanPaths, logger.With("component", "import")).Run(ctx)
+	imp := importer.New(pool, scanner, cat, printer, cfg.Library.ScanPaths, logger.With("component", "import"))
+	imp.DataDir = cfg.Storage.DataDir
+	go imp.Run(ctx)
 
 	// Download lifecycle (M502 #5523): every ten minutes, a download that
 	// failed or that nobody shares is retried, then given up and its album