fix: 🧩 文件树转换扩展名优化且添加注释

[Lemonadeccc]

文件树转换扩展名优化且添加注释

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] The commit message follows our guidelines: https://github.com/xun082/create-neat/blob/master/CONTRIBUTING.md
• [ x] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [ x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation update
• [ ] Performance improvement
• [ ] Test related changes
• [ ] Security fix
• [ ] Dependency update
• [ ] Revert changes
• [ ] Other... Please describe:

What is the current behavior?

• Closes #
• Related to #

What is the new behavior?

Does this PR introduce a breaking change?

• [ ] Yes
• [x ] No

Other information