系统更新增加客户端「全部更新」，依次远程更新所有启用实例。

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

templates/settings.html

@@ -166,7 +166,9 @@
             <h3>客户端远程更新</h3>
             <p class="muted field-hint">经 Bridge 探测版本并下发更新；客户端需已具备 <code>/api/hub/update</code></p>
             <div class="settings-actions">
+              <button type="button" class="settings-primary" id="client-update-all">全部更新</button>
               <button type="button" class="btn-secondary" id="client-update-refresh">刷新列表</button>
+              <span class="update-status muted" id="client-update-all-status"></span>
             </div>
           </div>
           <div class="table-wrap">
@@ -183,7 +185,7 @@
 {% endblock %}
 {% block scripts %}
 <script src="{{ url_for('static', filename='settings_backup.js') }}?v=2"></script>
-<script src="{{ url_for('static', filename='settings_update.js') }}?v=4"></script>
+<script src="{{ url_for('static', filename='settings_update.js') }}?v=5"></script>
 <script>
   HubSettingsBackup.boot();
   HubSettingsUpdate.boot();