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/rollup/dist/es/rollup.js

@@ -0,0 +1,17 @@
+/*
+  @license
+	Rollup.js v4.60.3
+	Mon, 04 May 2026 15:33:41 GMT - commit b47bdabeccbb7aa1b1d4117f2f4a781a9f6de297
+
+	https://github.com/rollup/rollup
+
+	Released under the MIT License.
+*/
+export { version as VERSION, defineConfig, rollup, watch } from './shared/node-entry.js';
+import './shared/parseAst.js';
+import '../native.js';
+import 'node:path';
+import 'path';
+import 'node:process';
+import 'node:perf_hooks';
+import 'node:fs/promises';