feat: install on Windows PowerShell

[lijunfeng722]

Summary

• Add install.ps1 mirroring install.sh: arch detection (amd64/arm64), latest-tag resolution via the /releases/latest redirect, archive + checksum download, SHA256

• Branch: feat/windows_os_install (1 commit ahead of main)

• Commit: 9c95606 feat: install on Windows PowerShell

• Files: install.ps1 (new, 126 lines), README.md, README.zh.md

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