第一期骨架：登录、实例登记、多机总览、内嵌/新标签打开。

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

templates/desk.html

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+{% extends "base.html" %}
+{% block title %}工作台 · 期权中控{% endblock %}
+{% block body %}
+<section class="desk">
+  <aside class="desk-side">
+    <h2>客户端</h2>
+    <ul class="desk-list">
+      {% for inst in instances %}
+      <li class="{% if current and current.id == inst.id %}active{% endif %}">
+        <a href="/desk?id={{ inst.id }}">{{ inst.name }}</a>
+      </li>
+      {% else %}
+      <li class="muted">无启用实例</li>
+      {% endfor %}
+    </ul>
+  </aside>
+  <div class="desk-main">
+    {% if current and open_url %}
+    <div class="desk-toolbar">
+      <strong>{{ current.name }}</strong>
+      <span class="muted">{{ current.base_url }}</span>
+      <a class="btn" href="{{ open_url }}" target="_blank" rel="noopener">新标签打开</a>
+      <a class="btn" href="/" >回总览</a>
+    </div>
+    <iframe class="desk-frame" src="{{ open_url }}" title="{{ current.name }}"></iframe>
+    {% else %}
+    <div class="empty">请从左侧选择客户端,或到「实例」添加公网 crypto_okx.</div>
+    {% endif %}
+  </div>
+</section>
+{% endblock %}