fix(helper): 云盘歌曲无法正确获取音质

[MoYingJi]

fix #728

[gemini-code-assist]

Summary of Changes

Hello @MoYingJi, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在解决云盘歌曲无法正确获取音质的问题。通过重构现有的音质级别映射逻辑，并引入专门处理歌曲对象中 privilege 属性的逻辑，确保了云盘存储的音乐能够准确地识别并显示其音质类型，从而提升了用户体验。

Highlights

• 音质判断逻辑重构: 将 handleSongQuality 函数中基于 level 属性的音质判断逻辑进行了重构，使用一个 levelQualityMap 对象替代了原有的多重 if 语句，提高了代码的可读性和可维护性。
• 云盘歌曲音质适配: 新增了针对云盘歌曲的音质适配逻辑。现在，当歌曲对象包含 privilege 属性时，函数会尝试从 privilege.playMaxBrLevel 或 privilege.plLevel 中提取音质信息，以确保云盘歌曲能够正确显示其音质。

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[gemini-code-assist]

Code Review

这个 PR 修复了云盘歌曲无法正确获取音质的问题。通过重构，代码现在使用一个映射表来处理基于 level 的音质，并为云盘歌曲增加了基于 privilege 对象的音质判断逻辑。代码的改动是有效的，并且通过使用映射表替代了原先的 if 链，提高了代码的可读性和可维护性。我提出了一些建议，包括修复一个潜在的 null 引用错误和一项性能优化，以进一步提高代码质量。

[gemini-code-assist]

为了提高性能，可以考虑将 levelQualityMap 移到 handleSongQuality 函数外部。由于它是一个常量，在模块作用域定义可以避免每次函数调用时都重新创建它。如果这个函数被频繁调用，这样做的好处会很明显。