curl -s -X POST https://kefuagents.com/api/gateway/v1/webhooks \
  -H "Authorization: Bearer $KEFUAGENT_GATEWAY_KEY" \
  -H 'Content-Type: application/json' \
  -d '{"idempotencyKey":"'$(uuidgen)'",
       "url":"https://your-agent.example.com/kefuagent-webhook",
       "eventTypes":["task.created","task.updated"]}'
# 响应里的 secret 只显示这一次，立即保存。