文件上传

{
  "url": "https://bucket.example.com/uploads/reference.png?signature=TEMP",
  "public_url": "https://cdn.example.com/uploads/reference.png",
  "method": "PUT",
  "object_key": "uploads/reference.png",
  "headers": {
    "Content-Type": "image/png"
  },
  "expires_at": 1787600900
}

{
  "code": "invalid_request",
  "message": "request validation failed"
}

{
  "code": "unauthorized",
  "message": "invalid API key"
}

{
  "code": "rate_limit_exceeded",
  "message": "too many requests"
}