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综合：素材从上传到播出全流程

未完成

示例

输入
solve()
期望输出
Creative lifecycle pipeline:
  CRV-T01 [MP4] -> live
    [ok] upload: CRV-T01 uploaded
    [approved] review: content_ok
    [ok] dispatch: queued for download to 5 screens
    [ok] download: downloaded to 5/5 screens
    [ok] schedule: scheduled in morning_peak slot
    [ok] playback: first playback confirmed
  CRV-T02 [AVI] -> rejected
    [fail] upload: unsupported_format
  CRV-T03 [MP4] -> rejected
    [ok] upload: CRV-T03 uploaded
    [fail] review: size_exceeded:80.0MB
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