Add per-workload replicas values and a chart-global scaleDown flag

Every Deployment/StatefulSet now takes its replica count from a replicas
value (default 1, explicit 0 allowed) via a new per-chart <chart>.replicas
helper; the helper uses a kindIs "invalid" nil check so an explicit 0 is
not swallowed by Helm's default function. A chart-global scaleDown flag
(default false) takes precedence: it renders every workload with
replicas: 0 and suspends the paperless-ngx consume CronJob, stopping the
app without uninstalling it (PVCs, Secrets, Services and Ingress remain).

Defaults leave the rendered manifests byte-identical to main, so all
published charts get a minor version bump; the template-chart carries the
reference helper implementation and stays unversioned.

Fixes #25

calibre-web-automated/Chart.yaml

@@ -4,7 +4,7 @@ type: application
 name: calibre-web-automated
 description: A Helm chart to deploy calibere-web-automated
 
-version: 3.0.0+upv4.0.6
+version: 3.1.0+upv4.0.6
 appVersion: v4.0.6
 
 maintainers: