chore(deps): update devdependency nuxt to v4

Author: renovate[bot]

package.json

@@ -64,7 +64,7 @@
     "json-schema": "^0.4.0",
     "marked": "^15.0.7",
     "monaco-editor": "^0.52.2",
-    "nuxt": "^3.15.4",
+    "nuxt": "^4.0.2",
     "nuxt-windicss": "^3.0.1",
     "prettier": "^3.5.2",
     "prismjs": "^1.29.0",