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/vite-node/dist/source-map.d.ts

@@ -0,0 +1,14 @@
+import { TransformResult } from 'vite';
+import { E as EncodedSourceMap } from './trace-mapping.d-xyIfZtPm.js';
+
+interface InstallSourceMapSupportOptions {
+    getSourceMap: (source: string) => EncodedSourceMap | null | undefined;
+}
+declare function withInlineSourcemap(result: TransformResult, options: {
+    root: string;
+    filepath: string;
+}): TransformResult;
+declare function extractSourceMap(code: string): EncodedSourceMap | null;
+declare function installSourcemapsSupport(options: InstallSourceMapSupportOptions): void;
+
+export { extractSourceMap, installSourcemapsSupport, withInlineSourcemap };