Mathieu Virbel
f4a5c98328
Add diagnostic and setup commands so users can verify their environment and install greyproxy without leaving greywall: - `greywall check`: shows version, platform deps, security features, and greyproxy installation/running status (absorbs old --version output) - `greywall setup`: downloads greyproxy from GitHub releases and shells out to `greyproxy install`, or auto-starts if already installed - `--version` simplified to single-line output for scripting New `internal/proxy/` package handles greyproxy detection (LookPath + /api/health endpoint), GitHub release fetching, tar.gz extraction, and service lifecycle management.