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>

internal/api/admin_suspect_sources.go

@@ -31,8 +31,9 @@ type suspectTrackView struct {
 	// first pass (M498 #5439). VerdictAt is when it was last set.
 	Verdict   *string `json:"verdict"`
 	VerdictAt *string `json:"verdict_at"`
-	// SearchedAt is when the resolver last asked Lidarr to search the album for
-	// a better copy (#5447): null when it has not.
+	// Replacing: the album is on the wanted list for a clean copy (#5524);
+	// SearchedAt is when one was last searched for, null before the first.
+	Replacing  bool    `json:"replacing"`
 	SearchedAt *string `json:"searched_at"`
 }
 
@@ -115,7 +116,8 @@ func groupSuspectByDirectory(rows []dbq.ListSuspectSourceTracksRow) []suspectGro
 			at := row.SourceVerdictAt.Time.UTC().Format(time.RFC3339)
 			t.VerdictAt = &at
 		}
-		if row.SearchedAt.Valid {
+		t.Replacing = row.WantUpgrade == "rip"
+		if t.Replacing && row.SearchedAt.Valid {
 			at := row.SearchedAt.Time.UTC().Format(time.RFC3339)
 			t.SearchedAt = &at
 		}