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sync_engine_v2: 每台服务器推送前检查 Redis sync:cancel:{batch_id},
若已取消则跳过并标记 cancelled 状态,WS 广播 cancelled 计数。
websocket: broadcast_sync_progress 新增 cancelled 参数。
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>