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/embed_page_fragment.html

@@ -81,7 +81,9 @@
 </div>
 {% endmacro %}
 <div class="grid">
-        {% if page == 'key_monitor' %}
+        {% if page == 'dashboard' %}
+        {% include 'dashboard_panel.html' %}
+        {% elif page == 'key_monitor' %}
         {% include 'key_monitor_panel.html' %}
         {% elif page == 'trade' %}
         <div class="dual-panel-grid" style="grid-column:1/-1">