The first-run setup flow ended by redirecting the new admin to a
DocuSeal-branded newsletter signup that POSTed to the upstream
project's mailing-list endpoint. That has no place in WaboSign —
strip the controller, view, route, helper constant, i18n keys (7
locales), and system spec, and redirect setup#create straight to
root_path.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>