feat: video rips and stray copies handle themselves (M498 #5439)

- The resolver also merges cross-release and mismatch groups where Lidarr
  maps exactly one copy: the others fulfil nothing, so removing them opens no
  hole (D-a rule 1). That covers a rip beside the clean copy on another
  release and a wrong-file import Lidarr holds unmapped. With two or more
  mapped copies each fulfils its own release and nothing is removed.
- A track whose file name carries a video-rip marker is held back from radio
  and the system mixes (tracks.source_verdict, migration 0077). It still plays
  when chosen. A renamed file is released; the operator's "fine" sticks.
- Suspect sources shows what was done to each track, with "This one is fine"
  and "Hold back again" (PUT /api/admin/library/suspect-sources/{id}).
- The Liked list prefers a copy that is not held back.

Replacing a rip that has no clean copy is left for the operator to decide.

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

internal/recommendation/shuffle_test.go

@@ -111,3 +111,18 @@ func TestShuffle_OneCopyPerSong(t *testing.T) {
 		t.Errorf("got %v, want two tracks: one copy of the song", titles(out))
 	}
 }
+
+// A video rip held back from radio (M498 #5439) is never chosen, even to fill
+// the request.
+func TestShuffle_SkipsHeldBackRips(t *testing.T) {
+	suspect := "suspect"
+	fine := "fine"
+	rip := cand("000000000001", ScoringInputs{IsGeneralLiked: true})
+	rip.Track.SourceVerdict = &suspect
+	cleared := cand("000000000002", ScoringInputs{})
+	cleared.Track.SourceVerdict = &fine
+	out := Shuffle([]Candidate{rip, cleared}, defaultWeights(), time.Now(), fixedRNG(0.5), 10, DiversityCaps{})
+	if got := titles(out); len(got) != 1 || got[0] != "000000000002" {
+		t.Errorf("got %v, want only the track marked fine", got)
+	}
+}