wh 0274bb470a feat(US3+4): video frame extraction + video-to-text — POST /api/v1/video/* ...

- app/models/video_models.py: ExtractFramesRequest, VideoToTextRequest,
  FrameInfo, VideoJobCallback, VideoAcceptedResponse
- app/services/video_service.py: interval+keyframe frame extraction,
  uniform-sample video-to-text, HTTP callback, temp file cleanup
- app/routers/video.py: size check helper (_check_video_size via head_object),
  BackgroundTasks enqueue for both endpoints
- tests: 6 service + 4 router tests, 10/10 passing

2026-04-10 16:00:08 +08:00

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