Refactor Authentik blueprints into common.yaml (shared admins group),
grafana.yaml (updated with !Find and groups scope), and forgejo.yaml
(new provider + application). Add forgejo-client-secret to ExternalSecret
and worker deployment. Configure Forgejo oauth2_client for auto-registration
with login-based account linking to safely preserve existing accounts.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
