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/stats.html

@@ -5,7 +5,6 @@
 <div class="card stats-summary-card">
     <div class="stats-toolbar">
         <span id="stats-updated" class="hint">正在加载统计…</span>
-        <button type="button" class="btn-secondary" id="stats-refresh-btn">重新计算</button>
     </div>
     <div class="stat-grid stat-grid-summary" id="stats-summary">
     <div class="stat-item"><div class="label">总交易次数</div><div class="value" data-k="total_trades">-</div></div>
@@ -45,9 +44,7 @@
 
 <style>
 .stats-summary-card{margin-bottom:1.25rem}
-.stats-toolbar{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.75rem;flex-wrap:wrap}
-.stats-toolbar .btn-secondary{width:auto;padding:.45rem .85rem;border-radius:8px;border:1px solid var(--input-border);background:var(--toggle-bg);color:var(--text-primary);cursor:pointer;font-size:.78rem}
-.stats-toolbar .btn-secondary:hover{border-color:var(--accent);color:var(--accent)}
+.stats-toolbar{display:flex;align-items:center;justify-content:flex-start;gap:1rem;margin-bottom:.75rem;flex-wrap:wrap}
 .stat-grid-summary{
     display:flex;flex-wrap:nowrap;align-items:stretch;gap:0;
     margin-bottom:0;overflow-x:auto;-webkit-overflow-scrolling:touch;