Add coulomb-social Helm chart and deploy targets

Chart mirrors vergabe-teilnahme Django probe/secret pattern. Non-secret
values pin KeyCape OIDC and user-engine URL; env Secret holds secrets.
Makefile: dry-run, deploy, ingress, status, logs.

charts/coulomb-social/templates/service.yaml

@@ -0,0 +1,27 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ include "coulomb.fullname" . }}
+  labels: {{- include "coulomb.labels" . | nindent 4 }}
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+    - port: {{ .Values.service.port }}
+      targetPort: {{ .Values.service.targetPort }}
+      protocol: TCP
+      name: http
+  selector: {{- include "coulomb.selectorLabels" . | nindent 4 }}
+{{- if .Values.persistence.media.enabled }}
+---
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: {{ include "coulomb.fullname" . }}-media
+  labels: {{- include "coulomb.labels" . | nindent 4 }}
+spec:
+  storageClassName: {{ .Values.persistence.media.storageClass }}
+  accessModes: [{{ .Values.persistence.media.accessMode }}]
+  resources:
+    requests:
+      storage: {{ .Values.persistence.media.size }}
+{{- end }}