Théophile Gervreau-Mercier f5d3281c43 security: fix all LOW priority items from TODO.SECURITY.md ...

Item 13 — Remove deprecated X-XSS-Protection header
- nginx/posterg.conf: header removed (was '1; mode=block')
- nginx/SECURITY_HEADERS.md: new file documenting header decisions
  and explaining why X-XSS-Protection is counterproductive

Item 14 — Add rel="noreferrer" to external target="_blank" link
- public/admin/thanks.php: rel="noopener" → rel="noopener noreferrer"

Item 15 — Explicit (int) casts on all integer HTML outputs
- public/index.php: (int) on item id, page numbers
- public/search.php: (int) on totalItems, year options, item id, pagination

Item 16 — Remove unused DATABASE_PATH constant
- config/bootstrap.php: define('DATABASE_PATH', ...) removed

docs/TODO.SECURITY.md updated: items 13-16 marked resolved and
moved to the ✅ Resolved section.

2026-02-08 13:54:02 +01:00

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