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/db/migrations/0077_track_source_verdict.down.sql

@@ -0,0 +1,3 @@
+DROP INDEX IF EXISTS tracks_source_suspect_idx;
+ALTER TABLE tracks DROP COLUMN IF EXISTS source_verdict_at;
+ALTER TABLE tracks DROP COLUMN IF EXISTS source_verdict;

internal/db/migrations/0077_track_source_verdict.up.sql

@@ -0,0 +1,15 @@
+-- 0077_track_source_verdict.up.sql — video rips are held back from mixes and
+-- radio until the operator says otherwise (Scribe milestone #498, #5439;
+-- operator decision D-d).
+--
+-- A file whose name carries a video-rip marker ("(Official Video)", "[HD]",
+-- #5410) holds the audio of an upload, which can carry intros, skits or a
+-- different take. The duplicate resolver sets 'suspect' on such a present
+-- track each pass, and clears it when the name no longer matches. 'suspect'
+-- keeps the track out of radio and the system mixes; it still plays when
+-- chosen. 'fine' is the operator's "this one is fine" and is never
+-- overwritten by the resolver.
+ALTER TABLE tracks ADD COLUMN source_verdict text
+    CONSTRAINT tracks_source_verdict_check CHECK (source_verdict IN ('suspect', 'fine'));
+ALTER TABLE tracks ADD COLUMN source_verdict_at timestamptz;
+CREATE INDEX tracks_source_suspect_idx ON tracks (id) WHERE source_verdict = 'suspect';