Configure ingress-authz-overlay to use centralized authz-adapter

[Copilot]

Two authz-adapter instances were running: one in security namespace (from main argo-stack chart) and one in argo-stack namespace (from ingress-authz-overlay). The overlay should reuse the centralized adapter, not deploy its own.

Changes

• values.yaml: Set deploy: false and namespace: security to point to existing adapter
• Documentation: Updated README.md and user guide to explain centralized vs. standalone configuration

Configuration

ingressAuthzOverlay:
  authzAdapter:
    deploy: false          # Don't deploy separate instance
    namespace: security    # Point to centralized adapter
    serviceName: authz-adapter
    port: 8080

Ingress annotations now route auth checks to http://authz-adapter.security.svc.cluster.local:8080/check.

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