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/get.js

@@ -0,0 +1,11 @@
+import superPropBase from "./superPropBase.js";
+function _get() {
+  return _get = "undefined" != typeof Reflect && Reflect.get ? Reflect.get.bind() : function (e, t, r) {
+    var p = superPropBase(e, t);
+    if (p) {
+      var n = Object.getOwnPropertyDescriptor(p, t);
+      return n.get ? n.get.call(arguments.length < 3 ? e : r) : n.value;
+    }
+  }, _get.apply(null, arguments);
+}
+export { _get as default };