feat: organized album directory and persistent /music bind-mount

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

worker/lyra_worker/pipeline.py

@@ -5,6 +5,7 @@ import psycopg
 
 from lyra_worker.adapters.base import SourceAdapter
 from lyra_worker.confidence import score_confidence
+from lyra_worker.library import album_dir
 from lyra_worker.quality import quality_class
 from lyra_worker.ranker import rank_candidates
 from lyra_worker.types import Candidate, MBTarget
@@ -150,7 +151,7 @@ def run_pipeline(
     # 4. download (fall-through)
     _set_state(conn, job_id, "downloading", "download")
     by_source = {a.name: a for a in adapters}
-    dest = f"{dest_root}/{target.artist}/{target.album}"
+    dest = album_dir(dest_root, target)
     winner = None
     result = None
     for candidate in ranked: