- Add Hammer library for rate limiting with ETS backend
- Rate limit login (5/min), magic link (3/min), newsletter (10/min), API (60/min)
- Add themed 429 error page using bare shop styling
- Enable HSTS in production with rewrite_on for Fly proxy
- Add security hardening plan to docs
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Subscribers with double opt-in confirmation, campaign composer with
draft/scheduled/sent lifecycle, admin dashboard with overview stats,
CSV export, and shop signup form wired into page builder blocks.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
