feat: add frontend source code

Add search-zen-50 React SPA source code to frontend/ directory.
Build artifacts (dist, node_modules, lock files) are gitignored.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/playwright.config.ts

@@ -0,0 +1,10 @@
+import { createLovableConfig } from "lovable-agent-playwright-config/config";
+
+export default createLovableConfig({
+  // Add your custom playwright configuration overrides here
+  // Example:
+  // timeout: 60000,
+  // use: {
+  //   baseURL: 'http://localhost:3000',
+  // },
+});