refactor(market_data): 优化交易日和停牌状态检查逻辑

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- 精简导入，移除未使用的functools.lru_cache依赖
- 新增is_trading_day函数，基于缓存交易日期集合快速判断交易日
- 优化get_latest_trade_date函数，避免整文件读取，改为逐行读取首条有效数据
- 简化calculate_trading_days_diff日期处理，改用字符串直接比较日期顺序
- 重构check_stock_suspended函数，统一处理单日和区间停牌数据格式并改进日志记录
- 统一输出字段命名，替换中文字段为英文is_suspended和suspend_dates
- 规范日志和打印输出，修正检查文件数和检查日期显示
- 优化输出CSV字段顺序和内容，保证数据一致性和清晰度

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lintao

2025-12-17 11:48:24 +08:00

parent 9b8096cc77

commit 28537e9260

3 changed files with 90 additions and 65 deletions

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