feat(11-01): 扩展回测指标 - 新增 NDCG@5、MRR、命中分布

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- 新增 _calculateNDCG 方法计算归一化折损累积增益
- 新增 _calculateMRR 方法计算平均倒数排名
- 新增 _calculateHitDistribution 方法统计各排名命中分布
- _runBacktestV3 返回结构扩展 ndcg_5、mrr、hit_distribution、precision_5
- 添加数据量检查（50期阈值），不足时返回警告

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leon

2026-05-01 15:09:44 +08:00

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