test: 更新 AgentScope 相关单元测试与集成测试

- 重命名 test_react_runner.py 为 test_runner.py
- 新增 test_utils.py 测试工具函数
- 更新现有测试用例适配新架构

backend/tests/unit/v1/auth/test_auth_gateway.py

@@ -340,3 +340,31 @@ class TestSupabaseAuthGateway:
 
         assert exc_info.value.status_code == 503
         assert exc_info.value.detail == "Auth service temporarily unavailable"
+
+    @pytest.mark.asyncio
+    async def test_get_user_by_email_uses_in_memory_cache(
+        self,
+        gateway: tuple[SupabaseAuthGateway, MagicMock, MagicMock],
+        monkeypatch: pytest.MonkeyPatch,
+    ) -> None:
+        sut, _, _ = gateway
+        user = SimpleNamespace(
+            id="user-1",
+            email="cached@example.com",
+            created_at="2026-03-16T00:00:00Z",
+            email_confirmed_at=None,
+        )
+        list_calls = {"count": 0}
+
+        def _fake_list_auth_users(_client: object) -> list[SimpleNamespace]:
+            list_calls["count"] += 1
+            return [user]
+
+        monkeypatch.setattr("v1.auth.gateway._list_auth_users", _fake_list_auth_users)
+
+        first = await sut.get_user_by_email("cached@example.com")
+        second = await sut.get_user_by_email("CACHED@example.com")
+
+        assert first.id == "user-1"
+        assert second.email == "cached@example.com"
+        assert list_calls["count"] == 1