feat(cache): add file-tree and download-link caches (DB by default) - #75

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请在本地运行 pnpm run build 后提交更新后的 cloud-functions/[[default]].js；也可下载本任务上传的 cloud-functions-refreshed 产物覆盖提交。

cloud-functions/[[default]].js 与源码不同步（后端代码或官方前端产物已更新）。

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-node@v4, actions/upload-artifact@v4, pnpm/action-setup@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/