feat(phase7): add generated video download endpoint

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

@@ -1,9 +1,17 @@
 from fastapi import APIRouter, Depends, HTTPException
 
 from app.dependencies import get_generated_video_repository
-from app.schemas.generated_video import GeneratedVideoResponse, ListGeneratedVideosResponse
+from app.schemas.generated_video import (
+    GeneratedVideoDownloadUrlResponse,
+    GeneratedVideoResponse,
+    ListGeneratedVideosResponse,
+)
 from packages.adapters.sqlalchemy_impl import SQLAlchemyGeneratedVideoRepository
-from packages.application import GetGeneratedVideoUseCase, ListGeneratedVideosUseCase
+from packages.application import (
+    GetGeneratedVideoDownloadUrlUseCase,
+    GetGeneratedVideoUseCase,
+    ListGeneratedVideosUseCase,
+)
 
 router = APIRouter()
 
@@ -59,3 +67,15 @@ def get_generated_video(
         height=item.height,
         fps=item.fps,
     )
+
+
+@router.get("/{video_id}/download-url", response_model=GeneratedVideoDownloadUrlResponse)
+def get_generated_video_download_url(
+    video_id: str,
+    generated_video_repository: SQLAlchemyGeneratedVideoRepository = Depends(get_generated_video_repository),
+) -> GeneratedVideoDownloadUrlResponse:
+    use_case = GetGeneratedVideoDownloadUrlUseCase(generated_video_repository)
+    download_url = use_case.execute(video_id)
+    if download_url is None:
+        raise HTTPException(status_code=404, detail=f"GeneratedVideo {video_id} not found")
+    return GeneratedVideoDownloadUrlResponse(video_id=video_id, download_url=download_url)