Phase 1 stub — country article (depth 4)

conseils-hygiene-du-sommeil

Article rendering layer coming in Phase 3 (will reuse the existing article component, parameterized by country + sub_hub).

{
  "route": "c/[country]/[pillar]/[sub_hub]/[slug]",
  "public_url": "/ci/energie/sommeil-recuperation/conseils-hygiene-du-sommeil",
  "country_code": "ci",
  "pillar_id": "energie",
  "sub_hub": "sommeil-recuperation",
  "article_slug": "conseils-hygiene-du-sommeil"
}