fix: 交易日历IB逻辑收窄——仅成交日期默认值使用银行间日历

- 回退 ylotc.calendar.js 至纯CHN，恢复全部日期选择器为证券交易所交易日历
- SwapTrade2Controller 新增 GetBestCountry 按年份判断IB数据是否存在
- 仅成交日期(TradeDate)默认值使用IB优先/CHN回退，开始日期和到期日期保持CHN
- 平仓及其他交易页面日期选择器不再受银行间日历影响

YLErpWeb/Controllers/SwapTrade2Controller.cs

@@ -67,7 +67,7 @@ namespace YLErp.Web.Controllers
                 {
                     TradeType = "收益互换",
                     UnderlyingInstrumentType = "Stock",
-                    StartDate = QdpCalendarHelper.GetNonHoliday(valuedateBLL.ValueDate, tradeDateCountry),
+                    StartDate = QdpCalendarHelper.GetNonHoliday(valuedateBLL.ValueDate),
                     TradeDate = QdpCalendarHelper.GetNonHolidayDefore(valuedateBLL.ValueDate.AddDays(-1), tradeDateCountry),
                     TraderId = CurUser.UserId,
                     TraderName = CurUser.UserName,

YLErpWeb/wwwroot/Scripts/base/ylotc.calendar.js

@@ -13,7 +13,7 @@ ylotc.isHoliday = function (date) {
         return false;
     }
     var y = date.getFullYear().toString();
-    var holidays = ylotc.calendar[y + "ib"] || ylotc.calendar[y];
+    var holidays = ylotc.calendar[y];
     if (Array.isArray(holidays)) {
         var d = date.getDate();
         var m = date.getMonth() + 1;//js月份从0开始