Add instance data dashboard (default off).

Read-only overview of live orders, key monitors, and strategy; show options/hedge only when present. Toggle via system settings nav prefs.

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

lib/instance/templates/dashboard_panel.html

@@ -0,0 +1,15 @@
+{# 实例数据看板:只读活跃监控总览 #}
+<div class="card full inst-dash-card" id="instance-dashboard" data-inst-dashboard="1">
+    <div class="inst-dash-head">
+        <div>
+            <h2 style="margin-bottom:4px">数据看板</h2>
+            <p class="muted inst-dash-desc">本户活跃监控总览 · 只读 · 期权/对冲有数据才显示</p>
+        </div>
+        <div class="inst-dash-head-actions">
+            <span class="muted inst-dash-updated" id="inst-dash-updated">—</span>
+            <button type="button" class="btn-sm" id="inst-dash-refresh">刷新</button>
+        </div>
+    </div>
+    <p class="inst-dash-status muted" id="inst-dash-status"></p>
+    <div class="inst-dash-sections" id="inst-dash-sections"></div>
+</div>