paramsobject可选
业务参数，契约按 endpoint 选择；请勿再次嵌套 params。
get_financial_event_detail: {"type":"object","properties":{"id":{"type":"string","description":"财经日历列表返回的事件 ID。"}},"required":["id"]}
search_financial_calendar: {"type":"object","properties":{"date":{"type":"string","description":"查询开始日期，格式 YYYY-MM-DD。"},"keyword":{"minLength":1,"type":"string","description":"财经日历标题模糊搜索关键词，必须是非空字符串。"},"endDate":{"type":"string","description":"可选结束日期，格式 YYYY-MM-DD；传入后 direction 和 limit 不再控制日期窗口。"},"direction":{"enum":[-1,1],"default":-1,"type":"integer","description":"未传 endDate 时的加载方向：-1=向未来加载，1=向历史加载。"},"limit":{"default":7,"minimum":1,"maximum":35,"type":"integer","description":"未传 endDate 时返回有数据日期的上限。"},"countryTypes":{"type":"array","items":{"type":"string","enum":["1","2","3","4","5","6","7","8","9","10","11"]},"description":"国家类型列表：1中国、2美国、3新加坡、4日本、5韩国、6加拿大、7澳大利亚、8德国、9英国、10法国、11其他。"},"eventTypes":{"type":"array","items":{"type":"integer","enum":[1,2,3,4]},"description":"事件类型列表：1=经济数据，2=事件，3=权息，4=休市。"},"markets":{"type":"array","items":{"type":"string","enum":["SG","BJ","US","MY","CA","HK","AU","JP","SH","SZ"]},"description":"市场代码列表，例如 [\"US\", \"HK\", \"SH\"]。"},"importanceLevels":{"type":"array","items":{"type":"integer","enum":[1,2,3]},"description":"重要等级列表：1、2、3 星。"}},"required":["date","keyword"]}
