* chore: switch postgres to official postgres:15.18 image Replace the unmaintained third-party ankane/pgvector:v0.5.1 image with the official postgres:15.18 image. No data migration needed — existing pg_data volumes are compatible. * docs: drop stale pgvector reference from docker setup Postgres image moved to official postgres:15.18; the extension is no longer bundled and is unused, so the docker docs should not advertise it. * Match the redis service by binding to localhost only for inter-container access --------- Co-authored-by: Juan Mrad <juansmrad@gmail.com>