feat(phase7): prefer presigned generated video downloads

apps/api/app/api/routes/generated_videos.py

@@ -1,5 +1,6 @@
 from fastapi import APIRouter, Depends, HTTPException
 
+from app.core.storage import MinIOService, get_minio_service
 from app.dependencies import get_generated_video_repository
 from app.schemas.generated_video import (
     GeneratedVideoDownloadUrlResponse,
@@ -73,9 +74,11 @@ def get_generated_video(
 def get_generated_video_download_url(
     video_id: str,
     generated_video_repository: SQLAlchemyGeneratedVideoRepository = Depends(get_generated_video_repository),
+    storage_service: MinIOService = Depends(get_minio_service),
 ) -> GeneratedVideoDownloadUrlResponse:
     use_case = GetGeneratedVideoDownloadUrlUseCase(generated_video_repository)
-    download_url = use_case.execute(video_id)
-    if download_url is None:
+    file_url = use_case.execute(video_id)
+    if file_url is None:
         raise HTTPException(status_code=404, detail=f"GeneratedVideo {video_id} not found")
+    download_url = storage_service.get_download_url(file_url)
     return GeneratedVideoDownloadUrlResponse(video_id=video_id, download_url=download_url)