系统设置增加「系统更新」Tab：中控本机更新与客户端远程更新，实例页入口移除。

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

templates/instances.html

@@ -23,20 +23,12 @@
   <p class="muted">暂无实例.先在 crypto_okx 配置 HUB_BRIDGE_TOKEN 并公网可访问.</p>
   {% endif %}
   {% for inst in instances %}
-  <details class="inst-row" data-id="{{ inst.id }}" data-name="{{ inst.name }}">
+  <details class="inst-row">
     <summary>
       <strong>{{ inst.name }}</strong>
       <span class="muted">{{ inst.base_url }}</span>
       {% if inst.enabled %}启用{% else %}停用{% endif %}
-      <span class="inst-version muted" data-inst-version>—</span>
     </summary>
-    <div class="inst-remote-actions">
-      <button type="button" class="btn" data-inst-update {% if not inst.enabled %}disabled title="实例未启用"{% endif %}>远程更新</button>
-      <button type="button" class="btn btn-secondary btn-sm" data-inst-refresh-ver>刷新版本</button>
-      <a class="btn" href="/desk?id={{ inst.id }}">内嵌打开</a>
-      <span class="inst-update-status muted" data-inst-update-status></span>
-    </div>
-    <p class="muted inst-update-hint">远程更新 = 客户端 git pull + pm2 restart；有持仓时慎用。</p>
     <form method="post" class="form-grid">
       <input type="hidden" name="action" value="update">
       <input type="hidden" name="id" value="{{ inst.id }}">
@@ -53,10 +45,11 @@
       <input type="hidden" name="id" value="{{ inst.id }}">
       <button type="submit" class="btn-danger">删除</button>
     </form>
+    <p>
+      <a class="btn" href="/desk?id={{ inst.id }}">内嵌打开</a>
+      <a class="btn btn-secondary" href="/settings?tab=update">系统更新</a>
+    </p>
   </details>
   {% endfor %}
 </section>
 {% endblock %}
-{% block scripts %}
-<script src="{{ url_for('static', filename='instances.js') }}?v=1"></script>
-{% endblock %}