- CSP: removed unsafe-eval, tightened frame-src to self + host ports,
added frame-ancestors, base-uri, form-action directives
- X-Frame-Options: SAMEORIGIN added after proxy_hide_header on all app proxies
- HSTS: max-age=31536000; includeSubDomains on all server blocks
- Rate limiting: 20r/s on /rpc/ with burst=40, 3r/s auth zone
- Added X-DNS-Prefetch-Control, Permissions-Policy payment=() header
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>