feat(frontend): add API client, layout, and routing

- Create Axios-based API client with sources, jobs, and dashboard endpoints
- Add responsive Layout component with navigation sidebar
- Set up React Router with Dashboard, Backups, and Settings routes
- Configure TanStack Query provider with default options
- Use lucide-react for navigation icons

frontend/node_modules/es-get-iterator/test/es6-shim.js

@@ -0,0 +1,11 @@
+'use strict';
+
+if (process.env.PRELOAD_GET_ITERATOR) {
+	// eslint-disable-next-line global-require
+	require('../');
+}
+
+require('es5-shim');
+require('es6-shim');
+
+require('./');