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/cli.js

@@ -0,0 +1,9 @@
+import { c as createCLI } from './vendor/cac.cdAtVkJZ.js';
+import 'pathe';
+import 'events';
+import 'picocolors';
+import './vendor/base.5NT-gWu5.js';
+import '@vitest/utils';
+import './vendor/constants.5J7I254_.js';
+
+createCLI().parse();