fix(types): declare TheAudioDB related artist results

app/chain/theaudiodb.py

@@ -1,4 +1,5 @@
 from app.chain.musicbrainz import MusicMetadataSourceChain
+from app.domain.context import MusicArtistInfo
 from app.schemas.types import MediaSource
 
 
@@ -11,7 +12,7 @@ class TheAudioDbChain(MusicMetadataSourceChain):
             self,
             media_id: str,
             count: int = 24,
-    ) -> list:
+    ) -> list[MusicArtistInfo]:
         """返回 TheAudioDB 关联艺术家；当前来源模块未提供该能力。"""
         del media_id, count
         return []