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新增美国市场研究数据契约与SEC时点财报 - #23
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现有股票适配器默认沪深代码与CNY，不能直接承载美股研究。本PR新增独立us_research命名空间，提供USD日线与企业行动快照、美国交易日历、历史成员事件、SEC原始归档与按accession接受时间选择的财报版本。
Yahoo数据明确标识为追溯、拆股归一化数据；没有支付日的分红不伪造到账时间。缺失历史成员、日线内部缺口、未知SEC接受时间和快照哈希变化都有明确处理。既有国内适配器保持原行为。
结算日历独立处理Columbus/Veterans银行假日与临时休市，覆盖星期六银行假日不顺延至星期五的规则。
验证：同步香港市场主线后，GitHub的Python3.10/3.11/3.12均555项通过、3项跳过；包含新增34项美国日历、数据完整性、哈希、成员知识时间和SEC重述测试。所有既有核心纯分支覆盖门槛通过。真实Yahoo试抓取返回YFRateLimitError，因此不宣称已完成真实市场数据验证。