[BUG] 输入获取的歌曲序号后, 未能进行下载.

**问题描述（Question description）**
如题.

- 搜索的关键字（Keyword）：秋桜
- 出错的音乐源（Music source）：QQ
- 使用的命令（Command used）：

**使用的环境（Environment）**
- 安装方式（Installation method）：pip install
- music-dl版本（music-dl version）：3.0.1
- 操作系统版本（OS version）：Deepin v20.1
- Python版本（Python version）：21.0.1

**截图**


**修改建议**
希望修复 qq 音乐源

The issue is about QQ music source failing to download after song selection. Start by examining the QQ music source module (likely in a source/qq.py or similar). Look at the download flow after user input. Check network requests and error handling. Run the tool with the provided keyword '秋桜' to reproduce the issue. Verify the fix by testing download functionality.

Scritto dal modello di indicizzazione a partire dal testo della issue.