docs: document homelab services, deployment, and repository review

portainer/README.md

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+# Portainer
+
+Container management UI backed by the host Docker socket.
+
+Kubernetes mounts the node's Docker socket and persists application data in
+`portainer-data-pvc`. This targets Docker on that node, not Kubernetes workloads.
+Compose uses the `portainer_data` volume for its state.
+
+Review initial administrator setup and route access before exposing the UI.
+Neither deployment has an active marker.
+
+## Inspect
+
+From the repository root:
+
+```sh
+kubectl get pods,svc,pvc -n portainer
+kubectl get events -n portainer --sort-by=.metadata.creationTimestamp
+```
+
+See the [repository README](../README.md) for deployment selection.