Nuxtjs Guideline: Routing — Define page metadata with definePageMeta. Description: Set page-level configuration and middleware. Do: definePageMeta for layout middleware title. Don't: Manual route meta configuration. Good Example: definePageMeta({ layout: 'admin', middleware: 'auth' }). Bad Example: router.beforeEach for page config. Severity: High. Docs: https://nuxt.com/docs/api/utils/define-page-meta.