chore(deps): remove unused eslint-plugin-nuxt (#2815)

## Summary

- Remove unused `eslint-plugin-nuxt` dev dependency
- This is a Nuxt 2-era plugin not referenced in any ESLint config
- The project already uses `@nuxt/eslint` as the modern replacement

## Test plan

- [ ] Verify `npm run lint` still works
- [ ] Verify `npm run build` still works

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: #2815

package.json

@@ -31,7 +31,6 @@
     "@vue/test-utils": "2.4.6",
     "esbuild": "0.27.3",
     "eslint": "9.39.4",
-    "eslint-plugin-nuxt": "4.0.0",
     "eslint-plugin-simple-import-sort": "12.1.1",
     "eslint-plugin-vue": "10.8.0",
     "nuxt": "4.3.1",