Split risk policy into its own navigation tab.

Move read-only risk control docs to /risk_policy before settings; keep transfers and exports on the settings page.

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

lib/instance/templates/index.html

@@ -64,12 +64,13 @@
         {% if options_nav_visible %}
         <a href="/options" class="{% if page == 'options' %}active{% endif %}">期权</a>
         {% endif %}
+        <a href="/risk_policy" class="{% if page == 'risk_policy' %}active{% endif %}">风控说明</a>
         <a href="/settings" class="{% if page == 'settings' %}active{% endif %}">系统设置</a>
     </div>
     {% with msg=get_flashed_messages() %}{% if msg %}<div class="flash">{{ msg[0] }}</div>{% endif %}{% endwith %}
 
     {% include 'instance_header_panel.html' %}
-    {% if page != 'settings' and page != 'options' %}
+    {% if page not in ('settings', 'risk_policy', 'options') %}
     {% include 'instance_top_bar.html' %}
     {% endif %}
 
@@ -467,6 +468,10 @@
         {% endif %}
     </div>
 
+    {% if page == 'risk_policy' %}
+    {% include 'risk_policy_panel.html' %}
+    {% endif %}
+
     {% if page == 'settings' %}
     {% include 'settings_panel.html' %}
     {% endif %}