Christian Nennemann f8ed2b83e9 fix: security hardening — self-hosted JS, XSS protection, SSRF blocking ...

- Replace all CDN script tags (marked, plotly) with self-hosted static files
- Add DOMPurify for sanitizing markdown-rendered HTML
- Add escapeHtml() helper to base.html for all innerHTML operations
- Sanitize dynamic data in innerHTML across 13 templates
- Add security headers (X-Content-Type-Options, X-Frame-Options, Referrer-Policy)
- Add SSRF protection to proposal intake URL fetcher (block private/loopback IPs)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-09 04:47:32 +01:00

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