fix(ai-avatar): 修复智能封面502 - cover_service视频URL重签+轮询扩容+连接池+路由异常兜底 #1843
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问题
smart-cover接口传入的video_url为upload_file()返回的裸public_url,OSS桶(xiaoxia-autocut)为私有桶,MediaKit GPU worker通过storageGW拉取时返回403 Forbidden。
根因
storage.upload_file()返回裸public_url(不带签名),私有桶匿名访问会被拒绝。lipsync_service已在bf6d02f2中修复,但cover_service的select_best_cover_frame未做同样处理。修复内容
_sign_video_url_for_mediakit()- 检测自家OSS URL并重签7天有效期,外部URL原样透传测试
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