feat(WP-0018/R6): Helm chart and runbook for Railiance01 deployment

Helm chart at deploy/helm/inter-hub/ with Deployment, Service, Ingress
(Traefik + letsencrypt-prod), and migration init container. Runbook at
deploy/railiance/RUNBOOK.md with build, push, rotate, rollback procedures.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

deploy/helm/inter-hub/templates/ingress.yaml

@@ -0,0 +1,30 @@
+{{- if .Values.ingress.enabled }}
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: {{ .Release.Name }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app: {{ .Release.Name }}
+  annotations:
+    {{- toYaml .Values.ingress.annotations | nindent 4 }}
+spec:
+  ingressClassName: {{ .Values.ingress.className }}
+  {{- if .Values.ingress.tls }}
+  tls:
+    - hosts:
+        - {{ .Values.ingress.host }}
+      secretName: {{ .Release.Name }}-tls
+  {{- end }}
+  rules:
+    - host: {{ .Values.ingress.host }}
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: {{ .Release.Name }}
+                port:
+                  number: {{ .Values.service.port }}
+{{- end }}