chore(deps): update nuxt framework to v4

Author: renovate[bot]

docs/package.json

@@ -17,7 +17,7 @@
     "@nuxt/content": "^3.5.1",
     "@nuxt/image": "^1.10.0",
     "@nuxt/ui-pro": "^3.1.1",
-    "nuxt": "^3.17.2",
+    "nuxt": "^4.0.3",
     "nuxt-llms": "0.1.2",
     "nuxt-og-image": "^5.1.3"
   },

package.json

@@ -47,7 +47,7 @@
     "test:types": "pnpm dev:prepare && tsc --noEmit && nuxi typecheck playground"
   },
   "dependencies": {
-    "@nuxt/kit": "^3.17.1",
+    "@nuxt/kit": "^4.0.3",
     "@tailwindcss/postcss": "^4.1.6",
     "@tailwindcss/vite": "^4.1.6",
     "pathe": "^2.0.3",
@@ -61,7 +61,7 @@
     "@nuxt/test-utils": "^3.17.1",
     "eslint": "^9.21.0",
     "happy-dom": "^17.4.7",
-    "nuxt": "^3.17.2",
+    "nuxt": "^4.0.3",
     "typescript": "^5.8.3",
     "vitest": "^3.1.3",
     "vue-tsc": "^2.2.10"