feat: public API, SEO and existing surfaces

features/integration.qa.md

@@ -25,7 +25,8 @@ Catalogue spec (pure data, no mount, imports web/src/data/apiCatalogue.ts):
      created_at, used_in, duplicate;
    - media list: items, total, page, size, counts (all, unused, duplicates), no next_cursor;
    - merge: articles_updated, merged;
-   - usage: id, title, published;
+   - usage: type, id, title, published, fields, story_id, lang;
+   - the two public language routes and the new keys of GET /v1/article/{id}/seo are in the catalogue (features/localization_public_api_and_surfaces.qa.md, item 9);
    - user list item: id, kind, username, display_name, email, role, status, created_at;
    - invite: id, kind, email, status, created_at, expires_at;
    - settings: version.