feat(boxstore): add configurable expiry for one-time downloads

Introduces a new configuration setting `one_time_download_expiry_seconds` to allow administrators to define a default expiration period for one-time downloads.

The retention logic in `boxstore` has been updated to use this global expiry value when a box is marked as a one-time download and no specific retention period is defined in the manifest.

lib/models/models.go

@@ -53,6 +53,7 @@ type BoxManifest struct {
 	AuthToken       string    `json:"auth_token,omitempty"`
 	DisableZip      bool      `json:"disable_zip,omitempty"`
 	OneTimeDownload bool      `json:"one_time_download,omitempty"`
+	Consumed        bool      `json:"consumed,omitempty"`
 }
 
 type BoxSummary struct {