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-app/templates/deployment.yaml

@@ -217,7 +217,7 @@ spec:
             {{- end }}
         {{- if .Values.elasticsearch.enabled }}
         - name: fluent-bit
-          image: fluent/fluent-bit:2.2
+          image: {{ include "cloudhost-app.baseImage" (dict "root" $ "image" "fluent/fluent-bit:2.2") }}
           resources:
             requests:
               cpu: "10m"