refactor(设备字段): 移除冗余字段并更新必填字段验证逻辑

移除设备模型中的owner、department和assetId字段，这些字段不再使用
更新设备导入接口的必填字段验证逻辑，使用硬编码的必填字段列表以保持前后端一致

backend/initDeviceFields.js

@@ -143,39 +143,12 @@ const defaultDeviceFields = [
     visible: true,
     isSystem: false
   },
-  {
-    fieldName: 'owner',
-    displayName: '责任人',
-    fieldType: 'string',
-    required: false,
-    order: 15,
-    visible: true,
-    isSystem: false
-  },
-  {
-    fieldName: 'department',
-    displayName: '所属部门',
-    fieldType: 'string',
-    required: false,
-    order: 16,
-    visible: true,
-    isSystem: false
-  },
-  {
-    fieldName: 'assetId',
-    displayName: '资产编号',
-    fieldType: 'string',
-    required: false,
-    order: 17,
-    visible: true,
-    isSystem: false
-  },
   {
     fieldName: 'brand',
     displayName: '品牌',
     fieldType: 'string',
     required: false,
-    order: 18,
+    order: 15,
     visible: true,
     isSystem: false
   }

backend/routes/devices.js

@@ -524,13 +524,16 @@ router.post('/import', async (req, res) => {
       });
       
       try {
-          // 动态获取必填字段配置（从数据库读取）
-          const requiredFieldConfigs = deviceFields.filter(field => field.required);
-          const requiredFieldNames = requiredFieldConfigs.map(field => field.displayName);
+          // 真正的必填字段列表（与前端表单一致）
+          // 注意：设备ID由系统自动生成，功率/购买日期/保修到期已改为非必填
+          const trulyRequiredFields = [
+            '设备名称', '设备类型', '型号', '序列号',
+            '所在机房名称', '所在机柜名称', '位置(U)', '高度(U)', '状态'
+          ];
 
           // 验证必填字段
           const missingFields = [];
-          for (const fieldName of requiredFieldNames) {
+          for (const fieldName of trulyRequiredFields) {
             const value = fieldValueMap[fieldName];
             if (!value || (typeof value === 'string' && value.trim() === '')) {
               missingFields.push(fieldName);