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feat(health): 统计计算模块 — 线性回归、移动平均、异常检测
新增 trend_stats.rs 纯函数模块，提供三个统计计算能力：
- compute_linear_regression: 最小二乘法线性回归，返回 slope/intercept/R^2/方向/日变化/周期变化
- compute_moving_average: 简单移动平均，支持任意窗口大小
- detect_anomalies: 均值 +/- N 标准差异常检测
包含 21 个单元测试，覆盖边界条件和正常用例。
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