feat: 文件夹批量处理引擎（后端）

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- BatchWorker 单线程轮询 batch_jobs 表，处理 source=batch 的运行，
  与主调度器互不抢占（next_queued_run 排除 batch 来源）
- 直接读取用户所选文件夹下的视频逐个执行流水线，不上传到工作目录；
  中间态与产物落在视频旁同名文件夹，batch.done.json 完成标记去重
- 支持暂停/继续、失败容错（单视频失败不阻塞后续）、删除任务只清库
- 孤儿清理跳过 source=batch 运行，防止误删用户视频文件夹
- workflow_runs 新增 source 列（upload/batch），旧库自动迁移

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cat-shark

2026-08-23 16:25:09 +08:00

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commit 711867e79f

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tests/test_batch.py

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