Simon
0d05bfd187
feat(factor): C1 因子相关性分析（横截面 Spearman 矩阵 + API）
- evaluation.factor_correlation_report：多因子共同日期 ∩ 后逐日横截面 Spearman 相关
取均值 → FactorCorrelationReport（冗余剔除前置，v3 §12 Correlation→Redundancy）
- ResearchService.run_factor_correlation + POST /api/factor-correlations
（universe/factors/period；与其它研究同装配口径）
- tests/test_factor_correlation.py：矩阵对角=1/近线性±相关符号/对称/无共同日期补零、
API 冒烟；全量 pytest 通过
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