feat(training): 实现 Trainer 模块化重构 (Trainer V2)

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- 新增 FactorManager 组件：统一管理多种来源因子
- 新增 DataPipeline 组件：完整数据处理流程（注册、过滤、划分、预处理）
- 新增 Task 策略组件：BaseTask 抽象基类、RegressionTask、RankTask
- 新增 ResultAnalyzer 组件：特征重要性分析和结果组装
- 新增 TrainerV2：作为纯调度引擎协调各组件
- 支持回归和排序学习两种训练模式
- 采用组合模式解耦训练流程，消除代码重复

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2026-03-24 23:35:31 +08:00

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