feat(api): route downloads through the configured downloads provider (#1802)

fluxer_api/src/api/config/APIConfig.ts

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
+import type {ResolvedDownloadsProvider} from '@fluxer/config/src/S3DownloadsProvider';
 import type {WorkerTaskName} from '../worker/WorkerLaneConfig';
 
 export type APIWorkerMode = 'all_lanes' | 'single_lane' | 'single_task';
@@ -150,6 +151,7 @@ export interface APIConfig {
 			static: string;
 		};
 	};
+	s3Downloads: ResolvedDownloadsProvider;
 	email: {
 		enabled: boolean;
 		provider: 'smtp' | 'none';