条件单列表改为中控后台并行缓存并以 SSE 推浏览器，下发仍走中控到实例。

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

templates/cond_orders.html

@@ -4,7 +4,8 @@
 <section class="page-head cond-head">
   <div>
     <h1>条件单</h1>
-    <p class="muted cond-lead">中控只下发；盯盘、买币、开平仓都在客户端。有仓或已占用的机器不可选。</p>
+    <p class="muted cond-lead">中控下发到实例；列表由中控后台缓存并推送到浏览器。盯盘与开平仓在客户端。有仓或已占用的机器不可选。</p>
+    <p class="muted" id="cond-status">读取缓存…</p>
   </div>
   <div class="cond-head-actions">
     <button type="button" class="btn" id="btn-cond-refresh">刷新</button>
@@ -93,6 +94,6 @@
 </div>
 {% endblock %}
 {% block scripts %}
-<script src="{{ url_for('static', filename='cond_orders.js') }}?v=6"></script>
+<script src="{{ url_for('static', filename='cond_orders.js') }}?v=7"></script>
 <script>HubCondOrders.boot();</script>
 {% endblock %}