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/trade.html

@@ -1,5 +1,5 @@
 {% extends "base.html" %}
-{% block title %}持仓监控 - 国内期货监控系统{% endblock %}
+{% block title %}下单监控 - 国内期货监控系统{% endblock %}
 {% block extra_css %}
 <link rel="stylesheet" href="{{ url_for('static', filename='css/trade.css') }}">
 {% endblock %}
@@ -105,7 +105,7 @@
             </div>
 
             <div class="card trade-card" id="positions">
-                <h2>持仓监控</h2>
+                <h2>当前持仓</h2>
                 <p class="hint pos-hint">开仓委托先显示「挂单中」，柜台成交后写入监控；超过 <strong>{{ pending_order_timeout_min }}</strong> 分钟未成交自动撤单，可手动撤单。</p>
                 <div class="card-body card-scroll" id="position-live-list">
                     <div class="empty-hint" id="position-placeholder">加载本地持仓…</div>