studio: expose karaoke_video in vault/music + flag karaoke videos in vault/videos

- vault/music items now carry karaoke_video/karaoke_video_file so the
Music Studio vault browser can present song+video as one entity
- vault/videos marks _karaoke.mp4 entries with topic 'Auto karaoke
lyrics video', style '16:9 Karaoke' and karaoke:true
- unit test covers both listing integration boundaries

Live-verified on :8090 (28 songs, 1 linked; 13 videos, 3 flagged).

moldovan-qwen/studio_server.py

@@ -2117,6 +2117,8 @@ async def list_vault_music():
                     "vocal_style": d.get("vocal_style", ""),
                     "dialect_level": d.get("dialect_level", 2),
                     "suno_style_prompt": d.get("suno_style_prompt", ""),
+                    "karaoke_video": d.get("karaoke_video"),
+                    "karaoke_video_file": d.get("karaoke_video_file"),
                     "created_at": d.get("created_at", os.path.getmtime(fpath))
                 })
         except Exception:
@@ -2354,12 +2356,14 @@ async def list_vault_videos():
     for fpath in sorted(glob.glob(os.path.join(VIDEOS_OUT_DIR, "*.mp4")), reverse=True):
         fname = os.path.basename(fpath)
         if not any(it.get("video_file") == fname for it in items):
+            is_karaoke = fname.endswith("_karaoke.mp4")
             items.append({
                 "id": fname,
                 "title": fname.replace(".mp4", "").replace("_", " ").title(),
-                "topic": "Rendered MP4",
-                "style": "9:16 Vertical",
+                "topic": "Auto karaoke lyrics video" if is_karaoke else "Rendered MP4",
+                "style": "16:9 Karaoke" if is_karaoke else "9:16 Vertical",
                 "video_file": fname,
+                "karaoke": is_karaoke,
                 "scenes_count": 4,
                 "created_at": os.path.getmtime(fpath)
             })

tests/unit/test_karaoke_auto_pipeline.py

@@ -96,6 +96,29 @@ def test_karaoke_success_links_video_into_song_manifest(client, monkeypatch):
             os.remove(os.path.join(AUDIO_DIR, wav_name))
 
 
+def test_vault_music_and_videos_expose_karaoke_fields(client):
+    """Integration boundary: vault/music and vault/videos listings expose
+    karaoke metadata so UI browsers can present song+video as one entity."""
+    import studio_server as ss
+    track_id = f"song_vaultfields_{int(time.time())}"
+    wav_name = f"{track_id}.wav"
+    song_file = os.path.join(ss.MUSIC_DIR, f"{track_id}.json")
+    with open(song_file, "w", encoding="utf-8") as f:
+        json.dump({"id": track_id, "title": "Vault Fields Test", "audio_file": wav_name,
+                   "full_lyrics": "vers"}, f)
+    r = client.get("/api/media/vault/music")
+    assert r.status_code == 200
+    mine = [i for i in r.json().get("items", []) if i["id"] == track_id]
+    assert mine, "song missing from vault/music"
+    assert "karaoke_video" in mine[0] and "karaoke_video_file" in mine[0]
+
+    r2 = client.get("/api/media/vault/videos")
+    assert r2.status_code == 200
+    kara = [v for v in r2.json().get("items", []) if v.get("karaoke")]
+    assert kara, "no karaoke-flagged videos in vault/videos"
+    assert all(v["video_file"].endswith("_karaoke.mp4") for v in kara)
+
+
 def test_kick_off_karaoke_skips_when_audio_missing(client):
     """Missing audio file → karaoke status skipped, no exception raised."""
     import threading as _th