Stands up the upstream Maykin Objecten API in the stack — own PostGIS DB
+ redis, an -init that runs setup_configuration from the external config
volume (migrate + provision a static token + register the Objecttypen API
as a trusted service), and a health-checked web on host :8021. Objecten's
setup_configuration registers Objecttypen (api_type orc, api_key auth with
the S-18a dev token) so an object can reference its objecttype.
Same verbatim-image + seed-config pattern as S-18a. Wired into WAIT_SVCS,
CFG_VOLS, the SEED invocations, seed-config.sh, and the CI log-dump. Pinned
objects-api 3.4.0 (nearest release to objecttypes-api 3.4.2).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>