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/Chart.yaml

@@ -0,0 +1,16 @@
+apiVersion: v2
+name: core-hub
+description: |
+  Core Hub API deployment for Railiance01 (hub.coulomb.social).
+type: application
+version: 0.1.0
+appVersion: "0.1.0"
+keywords:
+  - core-hub
+  - hub
+  - railiance
+home: https://forgejo.coulomb.social/coulomb/core-hub
+sources:
+  - https://forgejo.coulomb.social/coulomb/core-hub
+maintainers:
+  - name: railiance-apps