auto-claude: subtask-1-2 - Create Playwright configuration file with Chromium

- Add playwright.config.ts with Chromium-only setup for Lighthouse
- Configure three test projects: chromium, mobile-chrome, and tablet
- Enable remote debugging ports (9222-9224) for Lighthouse integration
- Set up web server to auto-start Next.js dev server
- Add tests/e2e directory with setup verification test

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

tests/e2e/setup.spec.ts

@@ -0,0 +1,13 @@
+import { test, expect } from '@playwright/test';
+
+/**
+ * Initial setup verification test.
+ * This test verifies the Playwright configuration is working correctly.
+ */
+test.describe('Setup Verification', () => {
+  test('Playwright is configured correctly', async ({ page }) => {
+    // This test serves as a configuration verification
+    // It will be removed or updated once proper E2E tests are added
+    expect(page).toBeDefined();
+  });
+});