fix: 修复导入ID重复覆盖逻辑、Excel列顺序对齐及UI优化

assetapp/models.py

@@ -61,7 +61,7 @@ class Asset(models.Model):
     # 管理信息
     responsible_person = models.CharField('负责人', max_length=50, blank=True, default='')
     department = models.CharField('使用部门', max_length=100, blank=True, default='')
-    user = models.CharField('使用人', max_length=50, blank=True, default='')
+    user = models.CharField('维护人', max_length=50, blank=True, default='')
     business_type = models.CharField('业务类型', max_length=100, blank=True, default='')
     status = models.CharField('状态', max_length=20, choices=STATUS_CHOICES, default='in_use')
     remark = models.TextField('备注', blank=True, default='')