更新v1.4版本，修复了一些已知问题

backend/services/admin_service.py

@@ -296,9 +296,8 @@ class AdminService:
             if not user:
                 return {"success": False, "message": "未找到对应的用户账号"}
             
-            password_hash = security.sha1_md5_password(new_password)
-            
-            result = await UserModel.update_password(user['user_id'], password_hash)
+            # UserModel.update_password 内部会进行哈希，无需预先哈希
+            result = await UserModel.update_password(user['user_id'], new_password)
             if result:
                 await execute_update(
                     "UPDATE users SET need_change_password = 1 WHERE user_id = %s",