The ACL now discovers its BIG zaaktype (by identificatie) and diploma
informatieobjecttype (by omschrijving) from OpenZaak's Catalogi API, instead of
being handed server-assigned URLs in config. A CachedZaaktypeCatalog resolves
lazily on first use and caches (success only, so a pre-publish miss is retried);
AclDefaults now carries ZaaktypeIdentificatie/InformatieobjecttypeOmschrijving.
Clear errors replace the opaque placeholder-URL 400. Unit tests cover the
resolver (resolve/cache/retry-on-failure) and the gateway lookups (match/miss).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>