feat(data): 实现数据获取层抽象接口

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- OHLCVData: 标准化K线数据结构
- DataSource: 数据源抽象接口（fetch/fetch_batch）
- DataCache: 缓存抽象接口（get/set/is_fresh）
- LocalFileCache: 本地文件缓存实现
- HybridDataSourceAdapter/TushareDataSource/YFinanceDataSource: 定制数据源适配器

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aszerW

2026-05-11 23:24:11 +08:00

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