some more re-org + fixes

vitest.config.integration.ts

@@ -36,7 +36,7 @@ const finalConfig = mergeConfig(baseViteConfig, defineConfig({
     exclude: [],
     // This setup script starts the backend server before tests run.
     globalSetup: './src/tests/setup/integration-global-setup.ts',
-    testTimeout: 15000, // Increased timeout for server startup and API calls.
+    testTimeout: 60000, // Increased timeout for server startup and API calls, especially AI services.
     // "singleThread: true" is removed in modern Vitest.
     // Use fileParallelism: false to ensure test files run one by one to prevent port conflicts.
     fileParallelism: false,