The "Export Configuration" admin feature (GET/POST /admin/export-config,
/admin/import-config) was already fully implemented — admin-gated,
redacts secrets, scoped to genuine config (settings/webhooks/SSO/scoring/
custom templates/users) rather than bulk data — but had zero test
coverage for an admin-sensitive data-migration endpoint.
Adds coverage for: admin-only gating on both endpoints, secret redaction
(SMTP password, SSO private key), custom-template-only scoping, safe user
import (forced password reset, no secret restoration from "[REDACTED]"
placeholders), and round-trip import idempotency. All pass against the
existing implementation — no bugs found.