Implement unified story generation flow

backend/tests/test_auth.py

@@ -73,6 +73,7 @@ class TestDevSigninRedirect:
 
     def test_dev_signin_uses_allowed_next_url(self, client: TestClient, monkeypatch):
         """允许的 next 参数应作为登录完成后的回跳地址。"""
+        monkeypatch.setattr(settings, "debug", True)
         monkeypatch.setattr(settings, "cors_origins", ["http://localhost:5173", "http://localhost:5174"])
 
         response = client.get(
@@ -86,6 +87,7 @@ class TestDevSigninRedirect:
 
     def test_dev_signin_rejects_untrusted_next_url(self, client: TestClient, monkeypatch):
         """不可信的 next 参数应回退到默认前端地址，避免开放重定向。"""
+        monkeypatch.setattr(settings, "debug", True)
         monkeypatch.setattr(settings, "cors_origins", ["http://localhost:5173", "http://localhost:5174"])
 
         response = client.get(