feat: 设备型号采集展示（devices 表 model 列+getprop 采集+管理页型号列/采集按钮+监控页兜底）+ fix: 监控页设备列错位（离线标签残留 td）、appver 端点误删恢复、appver 只查在线设备用轻量连接防挂起

templates/admin/monitor.html

@@ -630,12 +630,13 @@ select.form-control{cursor:pointer}
              placeholder="备注名（可选）" onkeydown="if(event.key==='Enter')addPoolDev()">
       <button class="btn btn-primary" onclick="addPoolDev()">添加设备</button>
       <button class="btn" onclick="reconnectPoolDevices()" title="并发 adb connect 池内全部设备">一键重连</button>
+      <button class="btn" onclick="refreshPoolModels()" title="采集池内在线设备的型号（getprop）">采集型号</button>
       <button class="btn" onclick="loadDevPool()">刷新</button>
       <span id="devpool-status" class="text-muted"></span>
     </div>
     <table class="table table-hover table-sm" style="margin-top:8px">
       <thead><tr>
-        <th>serial</th><th>名称</th><th>在线</th><th>状态</th><th>添加时间</th><th>操作</th>
+        <th>serial</th><th>名称</th><th>型号</th><th>在线</th><th>状态</th><th>添加时间</th><th>操作</th>
       </tr></thead>
       <tbody id="tb-devpool"></tbody>
     </table>