refactor(tests): reorganize tests into unittest/ and e2e/ directories

- Move all unit tests from tests/ to tests/unittest/
- Add tests/e2e/ directory for end-to-end tests
- Update conftest.py for new test structure
- Add new tests for auth dependencies, policies, route injection
- Add new tests for run callbacks, create store, execution artifacts
- Remove obsolete tests for deleted persistence layer

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/tests/e2e/conftest.py

@@ -0,0 +1,33 @@
+"""Shared fixtures for end-to-end API tests."""
+
+import pytest
+from fastapi.testclient import TestClient
+
+from app.plugins.auth.api.schemas import _login_attempts
+from app.plugins.auth.domain.config import AuthConfig
+from app.plugins.auth.runtime.config_state import reset_auth_config, set_auth_config
+from store.config.app_config import AppConfig, reset_app_config, set_app_config
+from store.config.storage_config import StorageConfig
+
+_TEST_SECRET = "test-secret-key-e2e-auth-minimum-32"
+
+
+@pytest.fixture()
+def client(tmp_path):
+    """Create a full app client backed by an isolated SQLite directory."""
+    from app.gateway.app import create_app
+
+    _login_attempts.clear()
+    reset_auth_config()
+    reset_app_config()
+    set_auth_config(AuthConfig(jwt_secret=_TEST_SECRET))
+    set_app_config(AppConfig(storage=StorageConfig(driver="sqlite", sqlite_dir=str(tmp_path))))
+
+    app = create_app()
+
+    with TestClient(app) as test_client:
+        yield test_client
+
+    _login_attempts.clear()
+    reset_auth_config()
+    reset_app_config()