RAILIANCE-WP-0012/0013/0014: Core Hub S5 release, CNPG observability, and follow-up workplans

Deliver the inbox-suggestion implementation from WP-0012: Core Hub Helm chart
and Makefile targets, CNPG backup status tooling, and updated backup handoff
docs. Archive the finished WP-0012 workplan and register ready follow-ups
WP-0013 (CNPG backup wiring + restore drill) and WP-0014 (Core Hub Helm
cutover and vergabe-teilnahme image refresh).

charts/core-hub/templates/service.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "corehub.fullname" . }}
+  labels: {{- include "corehub.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - name: http
+      port: {{ .Values.service.port }}
+      targetPort: http
+      protocol: TCP
+  selector: {{- include "corehub.selectorLabels" . | nindent 4 }}