Rename positions nav to order monitor and set as default landing page.

Remove stats recalculate button; login and home now open /positions without affecting refresh on other routes.

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

templates/settings.html

@@ -70,7 +70,7 @@
         <h2>导航显示</h2>
         <form action="{{ url_for('settings') }}" method="post">
             <input type="hidden" name="action" value="nav">
-            <p class="hint" style="margin-bottom:.75rem">关闭后顶栏隐藏对应入口，直接访问 URL 也会跳转回持仓监控。</p>
+            <p class="hint" style="margin-bottom:.75rem">关闭后顶栏隐藏对应入口，直接访问 URL 也会跳转回下单监控。</p>
             <div class="check-row">
                 {% for key, label in nav_toggles.items() %}
                 <label style="display:flex;align-items:center;gap:.5rem;cursor:pointer;white-space:nowrap">
@@ -322,7 +322,7 @@
     <div class="card">
         <h2>使用提示</h2>
         <ul class="settings-tips">
-            <li>持仓监控：连接 CTP 后下单、看持仓与品种推荐</li>
+            <li>下单监控：连接 CTP 后下单、看持仓与品种推荐</li>
             <li>策略交易：趋势回调自动补仓；顺势加仓需先开仓</li>
             <li>手续费：默认 CTP 柜台费率，连接后点同步</li>
             <li>手机端：浏览器菜单可「添加到主屏幕」安装 App</li>