fix(auth-callout): remove configmap seed config

[FrankSpitulski]

Summary

• Remove NATS seed fields from auth-callout serviceConfig defaults and docs.
• Document NATS seed material through AUTH_CALLOUT_NATS_* environment variables or a mounted secret config file.
• Move standalone devspace seed injection from serviceConfig to env vars.

Validation

• go test -count=1 ./... from auth-callout/
• helm lint auth-callout/deploy
• helm template test-release auth-callout/deploy
• helm template devspace auth-callout/deploy with AUTH_CALLOUT_NATS_* extraEnvs renders successfully
• helm dependency build deploy/nats-event-bus
• helm lint deploy/nats-event-bus
• helm template csc deploy/nats-event-bus -f local/nats/k8s/local-dev-values.yaml -f local/nats/k8s/csc/values.yaml --show-only charts/auth-callout/templates/configmap.yaml

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_{🕐 Last updated: 2026-05-29 21:11:21 UTC | Commit: db927c6}

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_{🕐 Last updated: 2026-05-29 21:12:28 UTC | Commit: db927c6}