docs: document homelab services, deployment, and repository review

vpn/xui/README.md

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+# 3x-ui
+
+Kubernetes deployment for the 3x-ui management panel in namespace `xui`.
+The `k8s/active` marker includes it in normal deploy selection.
+
+The workload, data mounts, and ports are in `k8s/xui.yaml`; panel routing and TLS
+are in the ingress and certificate files. Keep panel access and proxy protocol
+ports separate when changing the configuration.
+
+Back up the application's database and keys before upgrades. Check the actual
+host and volume paths before moving the workload to another node.
+
+```sh
+kubectl get pods,svc,pvc -n xui
+kubectl get events -n xui --sort-by=.metadata.creationTimestamp
+```
+
+See the [repository README](../../README.md) for deployment selection.