Update nextjs monorepo to v16

Author: renovate[bot]

frontend/package.json

@@ -83,7 +83,7 @@
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3.3.5",
-    "@next/bundle-analyzer": "^15.5.14",
+    "@next/bundle-analyzer": "^16.0.0",
     "@openapitools/openapi-generator-cli": "^2.30.2",
     "@tailwindcss/postcss": "4.2.2",
     "@types/d3-shape": "^3.1.8",
@@ -99,7 +99,7 @@
     "dotenv-cli": "^11.0.0",
     "eslint": "9.39.4",
     "eslint-config-airbnb": "^19.0.4",
-    "eslint-config-next": "^15.5.14",
+    "eslint-config-next": "^16.0.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-import-resolver-typescript": "^4.4.4",
     "eslint-plugin-import": "^2.32.0",