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

core/task_manager.py

@@ -824,9 +824,11 @@ class TaskManager:
         except Exception:
             online = set()
         try:
-            names = {d["serial"]: d["name"] for d in device_pool.list_devices()}
+            pool_rows = device_pool.list_devices()
+            names = {d["serial"]: d["name"] for d in pool_rows}
+            models = {d["serial"]: d["model"] for d in pool_rows}
         except Exception:
-            names = {}
+            names, models = {}, {}
 
         # 清理陈旧状态：serial 已不在设备池、且没有在跑 worker 的条目，
         # 避免设备被删除后其失败记录仍残留在"异常汇总"里
@@ -845,7 +847,7 @@ class TaskManager:
             r = running.get(serial, {})
             result.append({
                 "serial": serial,
-                "model": w.get("model", ""),
+                "model": w.get("model") or models.get(serial, ""),
                 "device_name": names.get(serial, ""),
                 "present": is_online,
                 "ready": is_online,          # 阶段 1：ready 概念并入在线状态