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/loupe/lib/function.js

@@ -0,0 +1,10 @@
+import getFunctionName from 'get-func-name'
+import { truncate } from './helpers'
+
+export default function inspectFunction(func, options) {
+  const name = getFunctionName(func)
+  if (!name) {
+    return options.stylize('[Function]', 'special')
+  }
+  return options.stylize(`[Function ${truncate(name, options.truncate - 11)}]`, 'special')
+}