Self-contained admin form that POSTs to the /webhook/onboard endpoint
(creates Clients + Projects + Activity Log rows). Hosted behind HTTP
basic auth at onboard.mivanchenko.de (Caddy basic_auth -> smb-demos
container). Not linked from the public demos; creates billable records
so it stays operator-only.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
