Windows support and prebuilt binaries

[moonLight-7k]

Windows support & Prebuilt binaries

A. Windows support

Windows is not fully supported.

• Add Windows transport to rmux-api (named pipes, e.g. uds_windows)
• Verify PTY spawn and shell fallback (cmd.exe / powershell)
• Verify rmux-app builds and runs on Windows
• Add a Windows CI job

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B. Prebuilt binaries

rmux currently requires building from source.

• Build release binaries for Linux, macOS, and Windows using GitHub Actions
• Attach binaries to GitHub Releases on tag push (and workflow_dispatch)
• Add download-and-run installation instructions to the README

Targets:

• x86_64-unknown-linux-gnu
• aarch64-apple-darwin
• x86_64-pc-windows-msvc