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/vitest/dist/execute.js

@@ -0,0 +1,11 @@
+export { V as VitestExecutor } from './vendor/execute.fL3szUAI.js';
+import 'node:vm';
+import 'node:url';
+import 'node:fs';
+import 'vite-node/client';
+import 'vite-node/utils';
+import 'pathe';
+import '@vitest/utils/error';
+import './path.js';
+import '@vitest/utils';
+import './vendor/base.5NT-gWu5.js';