refactor(node): move the Music handlers out of webrtc_server

MusicMixin in transport/webrtc/apps/music.py: tags and cover art, and the
audio transcode with the extension list that gates it.

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

1 files changed, 3 insertions, 2 deletions

diff --git a/packages/meshbay-node/tests/test_audio_transcode.py b/packages/meshbay-node/tests/test_audio_transcode.py
index acb39b7..941ada2 100644
--- a/packages/meshbay-node/tests/test_audio_transcode.py
+++ b/packages/meshbay-node/tests/test_audio_transcode.py
@@ -20,6 +20,7 @@ from meshbay_common.webcrypto import chunk_key_aes, decrypt_chunk_aes
 from meshbay_node.indexer.group_index import GroupIndex
 from meshbay_node.media_cache import MediaCache
 from meshbay_node.transport import webrtc_server as wrs
+from meshbay_node.transport.webrtc.apps import music
 from meshbay_node.transport.webrtc_server import WebRTCPeerSession
 
 from conftest import needs_subprocess, one_root
@@ -123,13 +124,13 @@ async def test_second_request_reuses_the_cached_transcode(tmp_path, media_cache,
     session, file_id = _session(tmp_path, clip, gek, media_cache)
 
     calls = {"n": 0}
-    real = wrs._transcode_audio_to_aac
+    real = music._transcode_audio_to_aac
 
     async def counting(path):
         calls["n"] += 1
         return await real(path)
 
-    monkeypatch.setattr(wrs, "_transcode_audio_to_aac", counting)
+    monkeypatch.setattr(music, "_transcode_audio_to_aac", counting)
 
     await session._do_audio_transcode_request({"file_id": file_id})
     session.sent.clear()