fix(platform): apply production hardening from audit plan

Close billing, tenancy, migration, build, and CI/CD gaps identified in the
audit: wallet/gateway guards, full-UUID namespaces, idempotent migrations with
base schema, stateful service stability, safer Dockerfiles/git builds, and
platform chart hardening (Redis auth, RollingUpdate, backups, Swagger off).

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/helm/cloudhost-platform/templates/redis-deployment.yaml

@@ -19,9 +19,26 @@ spec:
       labels:
         app: {{ include "cloudhost-platform.redis.fullname" . }}
     spec:
+      {{- with .Values.redis.imagePullSecrets }}
+      imagePullSecrets:
+        {{- toYaml . | nindent 8 }}
+      {{- end }}
       containers:
         - name: redis
           image: {{ .Values.images.redis | quote }}
+          args: ["--requirepass", "$(REDIS_PASSWORD)"]
+          env:
+            - name: REDIS_PASSWORD
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "cloudhost-platform.secretName" . }}
+                  key: redis-password
+            # redis-cli reads REDISCLI_AUTH so authenticated probes need no -a flag
+            - name: REDISCLI_AUTH
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "cloudhost-platform.secretName" . }}
+                  key: redis-password
           ports:
             - containerPort: 6379
           volumeMounts: