Bloquear cadastro de agente

curl -X POST "https://api.firecrawl.dev/v2/agent-signup/block" \
  -H "Content-Type: application/json" \
  -d '{
    "agent_signup_token": "a1b2c3d4..."
  }'

{
  "success": true,
  "message": "Agent key has been blocked and disabled."
}