curl --request GET \
  --url https://flozy-backend-1042419926531.us-central1.run.app/api/v1/external/leads/{leadId}/contacts \
  --header 'X-API-Key: <api-key>'

{
  "http_code": 200,
  "status": "success",
  "message": "Contacts retrieved",
  "data": {
    "items": [
      {
        "id": "550e8400-e29b-41d4-a716-446655440000",
        "full_name": "Jane Smith",
        "email": "jane@example.com",
        "phone_number": "+1 555 000 1234",
        "whatsapp_number": null
      }
    ],
    "pagination": {
      "page": 1,
      "limit": 25,
      "total": 1,
      "total_pages": 1
    }
  }
}