- CSRF: Require CSRF_SECRET in production, throw error on missing secret
- IP Allowlist: TRUST_PROXY must be explicitly set to 'true' for proxy headers
- Rate Limiter: Add proper proxy trust handling for client IP detection
- Login: Add browser form redirect support with safe URL validation
- Add custom admin login page with styled form
- Update CLAUDE.md with TRUST_PROXY documentation
- Update tests for new security behavior
BREAKING: Server will not start in production without CSRF_SECRET or PAYLOAD_SECRET
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>