RouterBase Homebrew Tap 0.1.0

Initial Homebrew tap release for RouterBase.\n\nIncludes:\n- Formula for installing the RouterBase CLI.\n- Homebrew audit, install, and test CI on macOS.\n- Formula URL pinned to RouterBase CLI v0.1.0.\n\nInstall:\nbash\nbrew tap RouterBase/tap\nbrew install routerbase\n\n\nDocs: https://docs.routerbase.com/