以下函数的实现，不应该从request.scenes中取，因为前端的数据有限，应该从数据库中读取所有对应的内容，作为生成视频的基础。
注意不要遗漏了部分信息
@router.post("/compose")
async def compose_video(request: VideoComposeRequest):
try:
video_path = video_service.generate_video_from_scenes(
scenes=request.scenes,
project_title=request.project_title,
add_bgm=request.add_bgm,
bgm_path=request.bgm_path,
)

    return {
        "success": True,
        "video_path": video_path,
    }
except Exception as e:
    raise HTTPException(status_code=500, detail=str(e))