K线本地缓存、图表交互优化与交易记录表格修复

新增 kline_store 优先读本地库；修复加载中遮挡、支持缩放与交易时段刷新；修复交易记录操作列被裁切。

Co-authored-by: Cursor <cursoragent@cursor.com>

templates/records.html

@@ -1,14 +1,14 @@
 {% extends "base.html" %}
 {% block title %}交易记录与复盘 - 国内期货监控系统{% endblock %}
 {% block content %}
-<div class="card" style="margin-bottom:1.25rem">
+<div class="card records-trade-card" style="margin-bottom:1.25rem">
     <h2>交易记录</h2>
     <div class="card-body">
         <label class="trade-switch-label">
             <input type="checkbox" id="trade-edit-switch">
             <span>修改/核对开关（开启后可编辑关键字段）</span>
         </label>
-        <div class="trade-table-wrap card-scroll">
+        <div class="trade-table-wrap">
             <table class="trade-table">
                 <thead>
                     <tr>