简化行情数据页面，修复同步数据无法补全历史的问题

ft-app/app/templates/index.html

@@ -4,27 +4,8 @@
 {% block breadcrumb %}<a href="/contracts/">合约总览</a>{% endblock %}
 
 {% block content %}
-<div class="stat-grid">
-  <div class="stat-card">
-    <div class="label">监控合约</div>
-    <div class="value">{{ contracts|length }}</div>
-  </div>
-  <div class="stat-card">
-    <div class="label">数据条数</div>
-    <div class="value">{{ total_bars }}</div>
-  </div>
-  <div class="stat-card">
-    <div class="label">最新日期</div>
-    <div class="value">{{ latest_date }}</div>
-  </div>
-</div>
 
 <div class="section-title">合约列表</div>
-<div class="tag-row">
-  {% for c in contracts %}
-  <a class="tag" href="/contracts/{{ c }}">{{ c }}</a>
-  {% endfor %}
-</div>
 
 <div class="table-wrap">
 <table>