Allow using `app/router.options.ts` or routes options for routing

[huang-julien]

Describe the feature

Hi :wave:

Currently the module only generate routes with the page directory. Is it possible to add a routes or router option to generate localized routes instead of using the page directory ?

Additional information

• [ ] Would you be willing to help implement this feature?
• [ ] Could this feature be implemented as a module?

Final checks

• [X] Read the contribution guide (The contribution guideline of nuxt-modules/i18n is compliant with Nuxt too).
• [X] Check existing discussions and issues.

[ineshbose]

Related: #1676

[ponjs]

// router.options.ts
import type { RouterConfig } from '@nuxt/schema'
import { localizeRoutes, type I18nRoutingOptions } from 'vue-i18n-routing'
import type { RouteRecordRaw } from 'vue-router'
import { nuxtI18nOptions } from '#build/i18n.options.mjs'

export default {
  routes: _routes =>
    localizeRoutes(
      [
        {
          name: 'Home',
          path: '/',
          component: () => import('@/pages/home/page.vue'),
        },
        {
          name: 'About',
          path: '/about',
          component: () => import('@/pages/about/page.vue'),
        },
      ],
      nuxtI18nOptions satisfies I18nRoutingOptions
    ) as RouteRecordRaw[],
} satisfies RouterConfig