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/acquire/search.go

@@ -50,6 +50,9 @@ const (
 	CodeProfile   = "profile"
 	CodeNoSeeders = "no_seeders"
 	CodeDoubt     = "doubt"
+	// CodeNotBetter: the album, but no better than the copy the library
+	// holds, for a want that is an upgrade (#5524).
+	CodeNotBetter = "not_better"
 )
 
 // Reason is one thing a verdict rests on.
@@ -64,6 +67,12 @@ type Reason struct {
 type Want struct {
 	ID pgtype.UUID
 	release.Want
+	// Floor is the tier of the copy the library holds, for an album wanted
+	// for a better one (#5524): a release must rank above it. "" for an
+	// album not held, and for a video rip, which any clean copy beats.
+	Floor release.Tier
+	// Held says the floor in words: "MP3, about 192 kbps".
+	Held string
 }
 
 // Candidate is one result with everything decided about it.
@@ -188,11 +197,11 @@ func (s *Service) For(ctx context.Context, want Want) Result {
 
 	blocked := s.Memory.blocked(ctx)
 	for i := range cands {
-		decide(&cands[i], want.Want, s.Profile, blocked)
+		decide(&cands[i], want, s.Profile, blocked)
 	}
 	sortCandidates(cands)
 	for _, i := range s.peek(ctx, cands) {
-		decide(&cands[i], want.Want, s.Profile, blocked)
+		decide(&cands[i], want, s.Profile, blocked)
 		r.Looked++
 	}
 	sortCandidates(cands)
@@ -209,7 +218,8 @@ func (s *Service) For(ctx context.Context, want Want) Result {
 // whether it is the album, then whether the profile takes its quality, then
 // whether anything leaves it to a person. A quality refusal said about the
 // wrong album would be noise, so identity comes first.
-func decide(c *Candidate, w release.Want, profile release.Profile, blocked map[string]string) {
+func decide(c *Candidate, want Want, profile release.Profile, blocked map[string]string) {
+	w := want.Want
 	c.Verdict, c.Reason, c.Reasons = "", "", nil
 	if why, ok := blocked[c.InfoHash]; ok && c.InfoHash != "" {
 		set(c, Blocked, Hard, CodeBlocked, why)
@@ -240,6 +250,14 @@ func decide(c *Candidate, w release.Want, profile release.Profile, blocked map[s
 		set(c, Refused, Soft, CodeProfile, "Your quality settings don’t take "+strings.ToLower(release.Label(c.Tier))+".")
 		return
 	}
+	if want.Floor != "" && release.Rank(c.Tier) <= release.Rank(want.Floor) {
+		held := want.Held
+		if held == "" {
+			held = strings.ToLower(release.Label(want.Floor))
+		}
+		set(c, Refused, Soft, CodeNotBetter, "No better than the copy you have ("+held+").")
+		return
+	}
 	if doubt != "" {
 		set(c, Review, Soft, CodeDoubt, doubt)
 		return