feat: 预览生成支持随机选素材 + 随机截取片段 (#1256) #1268

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xiaoxia merged 2 commits from feature/1256-random-asset-selection-preview into develop 2026-08-07 19:50:02 +08:00

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CI Bot 04b1e9522e style: auto-format with black + isort + prettier [skip ci-format-check]
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2026-08-07 11:33:42 +00:00
SaaS Frontend Agent 33e977cc2a feat: 预览生成支持随机选素材 + 随机截取片段 (#1256)
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- EditPlanClip.assign_asset() 新增可选 start_time 参数
- distribute_assets() 新增 random_selection 和 asset_durations 参数
- 新增 _calc_random_start_time() 计算随机起始点
- PlanGeneratorService 支持 random_preview 模式,自动获取素材时长
- 所有 4 种 editing_mode (ONE_TAKE/PIP/VOICE_OVER/VOICE_PIP) 均支持
- 完全向后兼容,不传新参数时行为不变
- 新增 18 个单元测试覆盖所有场景
2026-08-07 19:30:34 +08:00