curl -X POST 'https://app.memorylake.cn/openapi/memorylake/api/v3/workspaces/ws-7k8m9n0p1q2r/actors' \
  -H 'Authorization: Bearer sk_xxxxxx' \
  -H 'Content-Type: application/json' \
  -d '{
    "actor_id": "act-a1b2c3d4e5f6"
  }'

{
  "success": true,
  "data": {
    "actor_id": "act-a1b2c3d4e5f6",
    "custom_id": "user-ext-001",
    "actor_type": "HUMAN",
    "display_name": "Alice Chen",
    "bound_at": "2025-03-15T09:00:00Z"
  }
}