feat(system): 角色模型添加工作流支持

- 引入 FlowBaseModel 以支持工作流功能
- 使 Role 模型继承 CoreModel 和 FlowBaseModel

backend/dvadmin/system/models.py

@@ -9,8 +9,8 @@ from django.core.exceptions import ObjectDoesNotExist, ValidationError
 from application import dispatch
 from dvadmin.utils.models import CoreModel, table_prefix, get_custom_app_models
 
-
-class Role(CoreModel):
+from dvadmin3_flow.base_model import FlowBaseModel
+class Role(CoreModel,FlowBaseModel):
     name = models.CharField(max_length=64, verbose_name="角色名称", help_text="角色名称")
     key = models.CharField(max_length=64, unique=True, verbose_name="权限字符", help_text="权限字符")
     sort = models.IntegerField(default=1, verbose_name="角色顺序", help_text="角色顺序")