- Add package.json with three binary commands (sshifu, sshifu-server, sshifu-trust)
- Add Node.js wrapper scripts in bin/ for each command
- Add postinstall script to download platform-specific binaries from GitHub Releases
- Add .npmignore to exclude source code from npm package
- Update release workflow to publish to npm automatically
- Add linux-arm64 to build matrix
- Update README with npm installation instructions
- Add documentation for publishing and npm setup

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>