feat(system): implement robust batch user creation integrating existing pinyin logic and backend duplication prevention

inventory-backend/app/services/auth_service.py

@@ -260,6 +260,29 @@ class AuthService:
         # 返回时，最好把生成的ID告诉前端
         return new_user.to_dict()
 
+    @staticmethod
+    def batch_create_users(data_list, operator_role):
+        """
+        批量创建新用户。复用 create_user 的核心防重逻辑。
+        """
+        results = []
+        for data in data_list:
+            try:
+                # 复用单条创建逻辑，它自带张三/zhangsan1的防重机制
+                new_user_dict = AuthService.create_user(data, operator_role)
+                results.append({
+                    "cn_name": data.get('cn_name'),
+                    "account_id": new_user_dict.get('account_id'),
+                    "status": "success"
+                })
+            except Exception as e:
+                results.append({
+                    "cn_name": data.get('cn_name'),
+                    "error": str(e),
+                    "status": "fail"
+                })
+        return results
+
     @staticmethod
     def update_user(user_id, data, operator_role):
         """