feat(about): add John Phamous, add Security section with Mehmet Ince

- Add JohnPhamous as a core contributor for performance work (Vercel)
- Introduce a new Security section between Core Contributors and Ideation
- Credit Mehmet Ince (@mdisec) for security fixes
- Add securityTitle translation across all 17 supported locales

Co-authored-by: Cursor <cursoragent@cursor.com>

messages/de.json

@@ -1452,6 +1452,7 @@
     "supportNow": "Jetzt unterstützen",
     "techStackTitle": "Technologie-Evolution",
     "coreContributorsTitle": "Kern-Mitwirkende",
+    "securityTitle": "Sicherheit",
     "designCreditsTitle": "Design",
     "ideationTitle": "Ideenfindung",
     "communityContributorsTitle": "Community-Mitwirkende",