fix(auth,audit): ensure display_name persists in token refresh and add fallback in audit log

inventory-backend/app/models/system.py

@@ -39,7 +39,7 @@ class SysUser(db.Model):
         前端需要的是 '张三(zhangsan)'
         """
         raw_name = self.username
-        display_name = raw_name
+        real_name = ''
         account_id = raw_name
 
         # 解析存储格式: Name/ID
@@ -51,11 +51,15 @@ class SysUser(db.Model):
             display_name = f"{real_name}({acc_id})"
             # 单独提取账号ID (如果前端需要单独用)
             account_id = acc_id
+        else:
+            display_name = raw_name
 
         return {
             'id': self.id,
             'username': display_name,  # 列表显示: 张三(zhangsan01)
             'raw_username': self.username,  # 原始数据
+            'real_name': real_name,  # 真实姓名: 张三
+            'display_name': display_name,  # 显示名: 张三(zhangsan01)
             'account_id': account_id,  # 纯账号ID: zhangsan01
             'email': self.email,
             'department': self.department,