Add Authentik v2026.x with embedded PostgreSQL in new namespace. Includes HelmRelease with valuesFrom injection for encrypted credentials, cert-manager Certificate for auth.axion1337.chat, and Traefik IngressRoute. Authentik serves as OIDC provider for MAS; registration via invitation links only.
DNS A-record setup and Authentik UI configuration (OIDC provider creation) are manual post-deployment steps.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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