feat: 设备列表新增今日掉线次数显示；

src/views/device/list/const.ts

@@ -36,6 +36,13 @@ export const columns = [
     width: 300,
   },
   {
+    title: '今日掉线次数',
+    key: 'offlineCount',
+    dataIndex: 'offlineCount',
+    align: 'center',
+    width: 150,
+  },
+  {
     title: '操作',
     key: 'action',
     dataIndex: 'action',