Initial release of the oVirt/RHV Engine API simulator.

Stateful FastAPI lab with contract packs, Compose/Helm, Docker Hub release
targets, and Pulumi coverage across all Engine series (GET/POST/PUT/DELETE/HEAD).

docs/domains/datacenters-clusters.md

@@ -0,0 +1,21 @@
+**Language / Язык:** [English](datacenters-clusters.md) | [Русский](../ru/domains/datacenters-clusters.md)
+
+# Datacenters & clusters
+
+| Collection | Path |
+|---|---|
+| Datacenters | `/ovirt-engine/api/datacenters` |
+| Clusters | `/ovirt-engine/api/clusters` |
+
+Minimal seed creates one datacenter and one cluster. Demo seed expands hosts and
+VM density under the same topology.
+
+```bash
+curl -k -u 'admin@internal:secret' -H 'Accept: application/json' -H 'Version: 4' \
+  https://127.0.0.1/ovirt-engine/api/datacenters
+
+curl -k -u 'admin@internal:secret' -H 'Accept: application/json' -H 'Version: 4' \
+  https://127.0.0.1/ovirt-engine/api/clusters
+```
+
+Related: [Hosts](hosts.md), [Virtual machines](vms.md).