Special support for locale and page router

[freekh]

We want to have a simple way to setup different locales for different pages.
Added this item to track thoughts on how that should work.

[freekh]

One thought on how to support a quite typical setup where the app locale is the first part of a pathname.

// file: /app/[locale]/[[...path]]/page.val.ts

const schema = s.record(s.object({title: s.string() })).router(nextAppRouter({
  segments: {
    locale: s.locale("en_us")
  }
}))

export default c.define("/app/[locale]/[[...path]]/page.val.ts",schema, {
  "/en_us/my-page": {}
})