fix: 修复资产编辑无法保存的bug

- 恢复Asset模型STATUS_CHOICES定义，状态字段使用下拉选择而非文本输入
- 修复status默认值从中文'在用'改为英文key'in_use'，与数据库存储一致
- 编辑表单新增资产面值(asset_value)字段
- excel_utils适配字段类型变更(DecimalField→CharField, DateField→CharField等)

assetapp/models.py

@@ -21,6 +21,41 @@ class Category(models.Model):
 class Asset(models.Model):
     """硬件资产"""
 
+    # 基本信息
+    asset_number = models.CharField('资产编号', max_length=50, db_index=True)
+    name = models.CharField('设备名称', max_length=100)
+    category = models.ForeignKey(Category, on_delete=models.PROTECT, verbose_name='设备分类', related_name='assets')
+
+    # 硬件信息
+    brand = models.CharField('品牌', max_length=200, blank=True, default='')
+    model = models.CharField('型号', max_length=200, blank=True, default='')
+    asset_value = models.CharField('资产面值', max_length=50, blank=True, default='')
+    serial_number = models.CharField('序列号', max_length=200, blank=True, default='', db_index=True)
+
+    # 位置信息
+    location = models.CharField('机房', max_length=200, blank=True, default='', help_text='楼层/房间/区域')
+    cabinet = models.CharField('机柜', max_length=200, blank=True, default='')
+    cabinet_position = models.CharField('机柜位置', max_length=200, blank=True, default='', help_text='U位')
+
+    # 网络信息
+    bmc_address = models.CharField('BMC地址', max_length=200, blank=True, default='')
+    ip_address = models.CharField('IP地址', max_length=200, blank=True, default='')
+
+    # 显卡信息
+    has_gpu = models.CharField('是否带卡', max_length=50, blank=True, default='')
+    gpu_type = models.CharField('显卡类型', max_length=200, blank=True, default='')
+    gpu_count = models.CharField('卡数', max_length=50, blank=True, default='')
+
+    # 采购与质保
+    purchase_date = models.CharField('采购日期', max_length=50, blank=True, default='')
+    warranty_expire = models.CharField('质保到期', max_length=50, blank=True, default='')
+    supplier = models.CharField('供应商', max_length=200, blank=True, default='')
+
+    # 管理信息
+    responsible_person = models.CharField('负责人', max_length=200, blank=True, default='')
+    department = models.CharField('使用部门', max_length=200, blank=True, default='')
+    user = models.CharField('维护人', max_length=200, blank=True, default='')
+    business_type = models.CharField('业务类型', max_length=200, blank=True, default='')
     STATUS_CHOICES = [
         ('in_use', '在用'),
         ('idle', '闲置'),
@@ -28,43 +63,8 @@ class Asset(models.Model):
         ('scrapped', '已报废'),
     ]
 
-    # 基本信息
-    asset_number = models.CharField('资产编号', max_length=50, db_index=True)
-    name = models.CharField('设备名称', max_length=100)
-    category = models.ForeignKey(Category, on_delete=models.PROTECT, verbose_name='设备分类', related_name='assets')
-
-    # 硬件信息
-    brand = models.CharField('品牌', max_length=50, blank=True, default='')
-    model = models.CharField('型号', max_length=100, blank=True, default='')
-    asset_value = models.DecimalField('资产面值', max_digits=12, decimal_places=2, blank=True, null=True)
-    serial_number = models.CharField('序列号', max_length=100, blank=True, default='', db_index=True)
-
-    # 位置信息
-    location = models.CharField('机房', max_length=200, blank=True, default='', help_text='楼层/房间/区域')
-    cabinet = models.CharField('机柜', max_length=50, blank=True, default='')
-    cabinet_position = models.CharField('机柜位置', max_length=50, blank=True, default='', help_text='U位')
-
-    # 网络信息
-    bmc_address = models.GenericIPAddressField('BMC地址', blank=True, null=True)
-    ip_address = models.GenericIPAddressField('IP地址', blank=True, null=True)
-
-    # 显卡信息
-    has_gpu = models.CharField('是否带卡', max_length=20, blank=True, default='')
-    gpu_type = models.CharField('显卡类型', max_length=100, blank=True, default='')
-    gpu_count = models.IntegerField('卡数', blank=True, null=True)
-
-    # 采购与质保
-    purchase_date = models.DateField('采购日期', blank=True, null=True)
-    warranty_expire = models.DateField('质保到期', blank=True, null=True)
-    supplier = models.CharField('供应商', max_length=100, blank=True, default='')
-
-    # 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('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='')
+    status = models.CharField('状态', max_length=50, choices=STATUS_CHOICES, default='in_use')
+    remark = models.CharField('备注', max_length=500, blank=True, default='')
 
     # 系统字段
     created_by = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, blank=True, verbose_name='创建人')
@@ -82,14 +82,23 @@ class Asset(models.Model):
     @property
     def is_expired(self):
         if self.warranty_expire:
-            return self.warranty_expire < date.today()
+            try:
+                from datetime import datetime
+                expire_date = datetime.strptime(self.warranty_expire, '%Y-%m-%d').date()
+                return expire_date < date.today()
+            except (ValueError, TypeError):
+                return False
         return False
 
     @property
     def is_expiring_soon(self):
         if self.warranty_expire:
-            from datetime import timedelta
-            return date.today() <= self.warranty_expire <= date.today() + timedelta(days=30)
+            try:
+                from datetime import datetime, timedelta
+                expire_date = datetime.strptime(self.warranty_expire, '%Y-%m-%d').date()
+                return date.today() <= expire_date <= date.today() + timedelta(days=30)
+            except (ValueError, TypeError):
+                return False
         return False