Play Framework

Merge renovate/major-nuxtjs-monorepo: nuxt ^3.16.0 -> ^4.0.0

Verified empirically before merging (CI does not run pnpm install on the
skel, so its green check covers nothing here): pnpm install + nuxt generate
both succeed on Nuxt 4.5.2, and the generated index.html renders the real
page markup. Nuxt 4 tolerates the skel's root-level pages/layouts/app.vue
rather than requiring the new app/ srcDir layout.