提一个小建议，最好可以连带着歌词一起下载下来

如题。

The issue requests downloading lyrics alongside music. First, examine the existing download logic in the main script (likely music_dl.py or similar) to see how songs are fetched. Then, check each music source module (e.g., netease.py, qq.py) for available lyric APIs. Determine if lyrics are provided in the API responses and how to extract and save them. Finally, modify the download function to optionally fetch and write lyrics to a file, and update the CLI to accept a lyric download flag.

Escrita pelo modelo de indexação a partir do texto da issue.