refactor(media): unify source identity and music browsing

tests/test_media_scrape_endpoint.py

@@ -94,7 +94,7 @@ def test_recognize_file_routes_audio_to_music_chain() -> None:
         return_value=Context(
             meta_info=MetaMusic(title="晴天", artists=["周杰伦"]),
             media_info=MusicInfo(
-                source="musicbrainz",
+                media_source="musicbrainz",
                 media_id="977e6978-139d-425c-bb98-6b0c62d1e45e",
                 title="晴天",
                 artists=["周杰伦"],
@@ -118,7 +118,7 @@ def test_scrape_music_uses_musicbrainz_uuid_and_music_scraper() -> None:
     """手动音乐刮削应接受 MusicBrainz UUID 并经统一识别入口后写入音乐标签。"""
     fileitem = FileItem(storage="local", path="/music/晴天.flac", type="file")
     info = MusicInfo(
-        source="musicbrainz",
+        media_source="musicbrainz",
         media_id="977e6978-139d-425c-bb98-6b0c62d1e45e",
         title="晴天",
     )
@@ -139,7 +139,7 @@ def test_scrape_music_uses_musicbrainz_uuid_and_music_scraper() -> None:
 
     assert result.success is True
     media_chain.recognize_media.assert_called_once_with(
-        source="musicbrainz",
+        media_source="musicbrainz",
         mediaid="977e6978-139d-425c-bb98-6b0c62d1e45e",
         mtype=MediaType.MUSIC,
         music_type="recording",
@@ -148,7 +148,7 @@ def test_scrape_music_uses_musicbrainz_uuid_and_music_scraper() -> None:
         fileitem=fileitem,
         mediainfo=info,
         overwrite=True,
-        source="musicbrainz",
+        media_source="musicbrainz",
     )
 
 
@@ -179,7 +179,7 @@ def test_scrape_music_album_forwards_album_namespace() -> None:
     """手动专辑刮削必须把 Release Group ID 标记为 album。"""
     fileitem = FileItem(storage="local", path="/music/叶惠美", type="dir")
     info = MusicInfo(
-        source="musicbrainz",
+        media_source="musicbrainz",
         media_id="977e6978-139d-425c-bb98-6b0c62d1e45e",
         music_type="album",
         title="叶惠美",
@@ -207,7 +207,7 @@ def test_scrape_music_accepts_douban_recording_composite_id() -> None:
     """豆瓣音乐曲目 ID 使用“专辑ID:曲序”时应通过入口校验。"""
     fileitem = FileItem(storage="local", path="/music/晴天.flac", type="file")
     info = MusicInfo(
-        source="doubanmusic",
+        media_source="doubanmusic",
         media_id="1401853:3",
         music_type="recording",
         title="晴天",