feat(系统设置): 新增系统设置模块

- 添加SystemSetting模型用于存储系统配置
- 实现系统设置API路由，支持CRUD操作
- 新增系统设置前端页面，包含全局配置、外观设置、数据备份和关于页面
- 设备批量操作增强，支持批量移动、状态变更和导出
- 工单模型允许deviceId为空

modify.js

@@ -0,0 +1,19 @@
+const fs = require('fs');
+
+const content = fs.readFileSync('e:/IDC/jigui/frontend/src/pages/DeviceManagement.jsx', 'utf8');
+
+const startMarker = '];\n\n// 可调整列宽的表头组件';
+const endMarker = '\n\n// 防抖 Hook';
+
+const startIndex = content.indexOf(startMarker);
+const endIndex = content.indexOf(endMarker, startIndex);
+
+if (startIndex >= 0 && endIndex >= 0) {
+  const newContent = content.substring(0, startIndex + 3) + '\n\n// 防抖 Hook' + content.substring(endIndex + endMarker.length);
+  fs.writeFileSync('e:/IDC/jigui/frontend/src/pages/DeviceManagement.jsx', newContent, 'utf8');
+  console.log('Removed ResizeableTitle component');
+} else {
+  console.log('Could not find markers');
+  console.log('startMarker found:', startIndex >= 0);
+  console.log('endMarker found:', endIndex >= 0);
+}