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/temporal-secret.yaml

@@ -0,0 +1,14 @@
+{{- if .Values.temporal.enabled }}
+apiVersion: v1
+kind: Secret
+metadata:
+  name: {{ include "postiz.fullname" . }}-temporal-secret
+  labels:
+    {{- include "postiz.labels" . | nindent 4 }}
+type: Opaque
+data:
+  POSTGRES_PWD: {{ .Values.temporal.postgresql.password | b64enc | quote }}
+  {{- if .Values.temporal.apiKey }}
+  TEMPORAL_API_KEY: {{ .Values.temporal.apiKey | b64enc | quote }}
+  {{- end }}
+{{- end }}