feat(download): add DEB/RPM packages and Script/DEB/RPM install tabs

[majinghe]

What

• Add DEB/RPM native package downloads to the Server download page (amd64/arm64 for both formats), with links served from the R2 artifact CDN.
• Split the Linux install command area into Script / DEB / RPM tabs, each showing the matching install command:
  • Script: one-click install_rustfs.sh
  • DEB: download + sudo dpkg -i
  • RPM: download + sudo rpm -ivh
• DEB/RPM URLs are derived from the current release tag (e.g. 1.0.0-rc.1 → 1.0.0~rc.1 for DEB, 1.0.0_rc.1 for RPM) and hidden when no release is available.
• Attach an optional GITHUB_TOKEN to GitHub API requests to avoid anonymous rate limits.

Verification

• pnpm run lint passed
• npx tsc --noEmit passed
• pnpm run build passed

[vercel]

@majinghe is attempting to deploy a commit to the overtrue's projects Team on Vercel.

A member of the Team first needs to authorize it.

[majinghe]

增加了 RPM/DEB 安装步骤