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/@babel/runtime/helpers/esm/toConsumableArray.js

@@ -0,0 +1,8 @@
+import arrayWithoutHoles from "./arrayWithoutHoles.js";
+import iterableToArray from "./iterableToArray.js";
+import unsupportedIterableToArray from "./unsupportedIterableToArray.js";
+import nonIterableSpread from "./nonIterableSpread.js";
+function _toConsumableArray(r) {
+  return arrayWithoutHoles(r) || iterableToArray(r) || unsupportedIterableToArray(r) || nonIterableSpread();
+}
+export { _toConsumableArray as default };