ユーザー追加API Bug fix

backend/app/core/auth.py

@@ -67,8 +67,8 @@ def sign_up_new_user(db, email: str, password: str, firstname: str,lastname: str
         schemas.UserCreate(
             email=email,
             password=password,
-            firstname = firstname,
-            lastname = lastname,
+            first_name = firstname,
+            last_name = lastname,
             is_active=True,
             is_superuser=False,
         ),