3.2

feat(model): add is_indexable field to Entity and Page

Add is_indexable property to expose whether an entity or page may
be indexed by search engines, distinct from access control and
visibility flags. Update generated getters/setters, attribute maps,
and validation for the new field. Regenerate API docs for Entity
and Page models. Bump OpenAPI document version to 2.38.

Full Changelog: 3.1...3.2