fix: 修改歌曲ID功能的两个bug

[Starrah]

1. 图片会被移动到外层的Pacakge/StreamingAssets/...下。相当于是 210b7ec 修复的漏网之鱼。
2. DX谱面如music012345，会被错误的移动到music002345下。

此外还顺手做了一些refactor。

[gemini-code-assist]

Summary of Changes

Hello @Starrah, 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!

此拉取请求主要旨在修复歌曲ID功能中的两个关键错误，确保图片和DX谱面在修改ID后能够被正确地存储和引用。通过纠正文件路径逻辑和ID格式化问题，增强了系统的稳定性和数据一致性。此外，还对相关代码进行了重构，以优化其结构和清晰度。

Highlights

• 图片路径修复: 修复了图片在修改歌曲ID后被错误地移动到外部 Package/StreamingAssets 目录的问题，确保其存储在正确的 StreamingAssets 子目录中。
• DX谱面ID处理修复: 解决了DX谱面（如 music012345）在修改ID时，其目录名被错误地格式化为 music002345 的问题，现在能正确使用完整的 newId。
• 夹克图处理逻辑重构: 对夹克图（jacket）的文件移动逻辑进行了重构，通过统一处理 JacketPath 和 PseudoAssetBundleJacket，减少了代码重复并提高了可读性。
• VCS配置更新: 在 .idea/vcs.xml 中添加了 MaiLib 模块的Git版本控制映射。

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[gemini-code-assist]

Code Review

这个PR修复了修改歌曲ID功能中的两个bug，并且对夹克图片（jacket）处理逻辑进行了一些重构。修复是正确的，重构也提升了代码质量，减少了重复代码。整体来看是个不错的改进。我只对其中一个变量的命名提出了一个小建议，以进一步提高代码的可读性。