feat(helm): add Temporal support and expand env coverage for v2.21.8

- Chart.yaml: bump to version 1.1.0, appVersion v2.21.8
- values.yaml: add temporal section (enabled/address/namespace/tls/apiKey/postgresql),
  expand env (~40 non-sensitive vars) and secrets (~60 sensitive vars) to match
  current Postiz documentation — covers all social providers, email SMTP,
  OAuth OIDC, AI/generation, analytics, MCP, payments, short-link services
- postiz-config.yaml: inject TEMPORAL_ADDRESS (auto-computed or override),
  TEMPORAL_NAMESPACE and TEMPORAL_TLS when temporal.enabled or address is set
- temporal-deployment.yaml: temporalio/auto-setup:1.28.1, postgres12 backend,
  ES disabled, dynamicconfig volume mount, liveness/readiness probes
- temporal-service.yaml: ClusterIP on port 7233 (gRPC)
- temporal-dynamicconfig.yaml: ConfigMap with development-sql.yaml content
- temporal-init-job.yaml: post-install/upgrade Job that creates the temporal
  PostgreSQL user via the postgres superuser before Temporal starts
- temporal-secret.yaml: Secret for temporal PostgreSQL credentials
- NOTES.txt: post-install guidance, search-attribute creation reminder,
  multi-replica/local-storage warning, backup reminder

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

charts/postiz/templates/NOTES.txt

@@ -0,0 +1,46 @@
+Postiz has been deployed!
+
+Access URL:
+{{- if .Values.ingress.enabled }}
+  https://{{ (first .Values.ingress.hosts).host }}
+{{- else if eq .Values.service.type "NodePort" }}
+  http://<node-ip>:{{ .Values.service.nodePort }}
+{{- else }}
+  kubectl port-forward svc/{{ include "postiz.fullname" . }} 5000:80
+  http://localhost:5000
+{{- end }}
+
+{{- if .Values.temporal.enabled }}
+
+Temporal:
+  Internal address : {{ include "postiz.fullname" . }}-temporal:7233
+  Status           : kubectl get pods -l app.kubernetes.io/component=temporal
+  Init job logs    : kubectl logs job/{{ include "postiz.fullname" . }}-temporal-init
+
+  After first deploy, create Temporal search attributes:
+    kubectl exec deploy/{{ include "postiz.fullname" . }}-temporal -- \
+      temporal operator search-attribute create \
+        --namespace {{ .Values.temporal.namespace | default "default" }} \
+        --name organizationId --type Keyword \
+        --name postId --type Keyword
+{{- else if .Values.temporal.address }}
+
+Temporal (external): {{ .Values.temporal.address }}
+{{- else }}
+
+WARNING: Temporal is disabled and no address is configured.
+  Postiz v2.12.0+ requires Temporal for post scheduling.
+  Set temporal.enabled=true or provide temporal.address.
+{{- end }}
+
+{{- if and (gt (.Values.replicaCount | int) 1) (eq (.Values.env.STORAGE_PROVIDER | default "local") "local") }}
+
+WARNING: replicaCount={{ .Values.replicaCount }} with STORAGE_PROVIDER=local is unsupported.
+  Local uploads are not shared across replicas. Use Cloudflare R2 or an RWX PVC.
+{{- end }}
+
+Upgrade reminder:
+  Always back up the PostgreSQL database before upgrading Postiz:
+    kubectl exec -n <namespace> <postgresql-pod> -- \
+      pg_dump -U {{ .Values.postgresql.auth.username }} {{ .Values.postgresql.auth.database }} \
+      > postiz-backup-$(date +%Y%m%d).sql