fix: use pathToFileURL for dynamic import on Windows

[wan-kong]

1. 使用 rimraf 替代rm命令，保证可以在windows环境中正常build。
2. 修复 Windows 上运行 npx usage-board@latest 时报 ERR_UNSUPPORTED_ESM_URL_SCHEME 错误的问题。

根因： src/index.ts 中 loadNitroEntrypoint 函数使用 resolve() 获取绝对路径后直接传给 import()。在 Windows 上 resolve() 返回 C:\Users\...\server\index.mjs 形式的路径，但 Node.js ESM loader 要求动态 import() 必须使用 file:// URL scheme。

修复： 使用 Node.js 内置的 pathToFileURL() 将绝对路径转为 file:// URL，兼容所有平台。

- const mod = await import(entryPath)
+ const mod = await import(pathToFileURL(entryPath).href)

• Linux/macOS 上 pathToFileURL 产生 file:///path/to/file，行为不变
• Windows 上 pathToFileURL 产生 file:///C:/Users/.../file，ESM loader 可正确加载

Work with https://app.devin.ai/

Summary by CodeRabbit

• Chores
  • Enhanced build script with cross-platform file removal improvements for more reliable builds across operating systems.
  • Optimized server module loading to better support dynamic ESM imports and resolution at runtime.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 90b6c076-8781-4c6b-b70c-34e083eca30b

📥 Commits

Reviewing files that changed from the base of the PR and between e09a909 and 4934f1c.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (2)

• package.json
• src/index.ts

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📝 Walkthrough

Walkthrough

The PR updates the build script to use rimraf instead of rm for cross-platform file removal compatibility, and refactors the dynamic ESM module import to convert filesystem paths to file URLs before importing, improving module resolution reliability.

Changes

Build and Module Loading Improvements

Layer / File(s)	Summary
Build script and rimraf dependency package.json	Build script replaces rm with rimraf for removing dist/nitro.json, and rimraf ^6.1.3 is added to devDependencies for cross-platform compatibility.
Dynamic import with file URL src/index.ts	pathToFileURL is imported from node:url and applied to the entrypoint path before dynamic import to ensure proper ESM module resolution.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A path becomes a URL, rimraf dances cross-platform free,
Modules load with grace, no slashes to flee—
Small tweaks, big wins, the code runs clean and true,
Build scripts so portable, Windows loves it too! ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: using pathToFileURL for dynamic imports to fix Windows compatibility issues.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

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• Create PR with unit tests

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