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/recharts/es6/util/IfOverflowMatches.js

@@ -0,0 +1,8 @@
+export var ifOverflowMatches = function ifOverflowMatches(props, value) {
+  var alwaysShow = props.alwaysShow;
+  var ifOverflow = props.ifOverflow;
+  if (alwaysShow) {
+    ifOverflow = 'extendDomain';
+  }
+  return ifOverflow === value;
+};