List Webhook Destinations

curl https://identity.contra.id/v1/webhook-destinations \
  -H "x-api-key: $CONTRA_KEY"

{
  "destinations": [
    {
      "uuid":     "whd_b3f1…",
      "url":      "https://yourapp.com/contra/webhook",
      "version":  "v3",
      "events":   ["session.status_changed", "agent.revoked"],
      "active":   true,
      "secret_preview": "whsec_…aB12",
      "created_at": 1748566800
    }
  ]
}