chore(security): update dependencies to fix vulnerabilities

- Update Next.js to 15.5.7 and React to 19.0.1 (React2Shell fix)
- Update Nodemailer to 7.0.11 (Security fix)
- Update React Markdown and others to resolve all audit issues
- Add SECURITY-UPDATE.md

package.json

@@ -50,15 +50,15 @@
     "framer-motion": "^11.0.0",
     "gray-matter": "^4.0.3",
     "lucide-react": "^0.542.0",
-    "next": "^15.5.2",
+    "next": "^15.5.7",
     "node-cache": "^5.1.2",
     "node-fetch": "^2.7.0",
-    "nodemailer": "^6.10.0",
+    "nodemailer": "^7.0.11",
     "prisma": "^5.7.1",
-    "react": "^19.0.0",
-    "react-dom": "^19.0.0",
+    "react": "^19.0.1",
+    "react-dom": "^19.0.1",
     "react-icons": "^5.5.0",
-    "react-markdown": "^9.0.1",
+    "react-markdown": "^10.1.0",
     "react-responsive-masonry": "^2.7.1",
     "redis": "^5.8.2",
     "tailwind-merge": "^2.2.1"
@@ -78,16 +78,16 @@
     "@types/react-syntax-highlighter": "^15.5.11",
     "cross-env": "^7.0.3",
     "eslint": "^9",
-    "eslint-config-next": "15.1.7",
+    "eslint-config-next": "^15.5.7",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",
-    "nodemailer-mock": "^2.0.8",
+    "nodemailer-mock": "^2.0.9",
     "postcss": "^8",
     "tailwindcss": "^3.4.17",
     "ts-jest": "^29.2.5",
     "ts-node": "^10.9.2",
     "tsx": "^4.20.5",
-    "typescript": "^5.7.3",
+    "typescript": "5.9.3",
     "whatwg-fetch": "^3.6.20"
   }
 }