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/cac/index-compat.js

@@ -0,0 +1,11 @@
+const { cac, CAC, Command } = require('./dist/index')
+
+// For backwards compatibility
+module.exports = cac
+
+Object.assign(module.exports, {
+  default: cac,
+  cac,
+  CAC,
+  Command,
+})