[GET]
summary = "进程插件示例：获取预签名下载 URL（设备直取 Minio，不经网关）"
subject = "demo.storage.presign_download"
params = ["object_key: str"]
auth_required = false

[GET.response_model]
object_key = { type = "str", required = true }
presigned_url = { type = "str", required = true }
method = { type = "str", required = true }
expires = { type = "int", required = true }
timestamp = { type = "float", required = true }