feat(markets): add latency monitoring and heartbeat detection #17
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…er book collector - Add delay monitoring: track avg/max delay from event_ts to receipt_ts - Add heartbeat detection: warn if no data received for 30+ seconds - Add high latency warning: alert when delay exceeds 5 seconds - Update stats logging to include delay metrics - Update audit doc with new monitoring features
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变更摘要
订单簿采集器增强监控能力：
代码变更 (order_book.py)
receipt_ts - event_ts，统计平均/最大延迟delay_avg/delay_max字段文档更新 (ORDER_BOOK_AUDIT.md)
风险评估
低风险 - 仅增加监控逻辑，不影响核心写入流程