fix: pin next@16.2.3 in dashboard and website to resolve DoS vulnerability

- Dashboard: pinned next from 16.2.1 -> 16.2.3
- Website: pinned next from ^16 -> 16.2.3
- Regenerated both package-lock.json files

Patches GHSA-q4gf-8mx6-v5v3 (Denial of Service with Server Components)

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

Author: 2 people

website/package-lock.json

@@ -9,7 +9,7 @@
     "lint": "next lint"
   },
   "dependencies": {
-    "next": "^16",
+    "next": "16.2.3",
     "react": "^19",
     "react-dom": "^19",
     "tailwindcss": "^4",