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/Chart.yaml

@@ -0,0 +1,18 @@
+apiVersion: v2
+name: coulomb-social
+description: |
+  coulomb.social — co-creation platform (NetKingdom identity shell).
+  Standalone Django app; content migration deferred.
+type: application
+version: 0.1.0
+appVersion: "0.1.0"
+keywords:
+  - django
+  - coulomb
+  - social
+  - railiance
+home: https://forgejo.coulomb.social/coulomb/coulomb-social
+sources:
+  - https://forgejo.coulomb.social/coulomb/coulomb-social
+maintainers:
+  - name: railiance-apps