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/createSuper.js

@@ -0,0 +1,16 @@
+import getPrototypeOf from "./getPrototypeOf.js";
+import isNativeReflectConstruct from "./isNativeReflectConstruct.js";
+import possibleConstructorReturn from "./possibleConstructorReturn.js";
+function _createSuper(t) {
+  var r = isNativeReflectConstruct();
+  return function () {
+    var e,
+      o = getPrototypeOf(t);
+    if (r) {
+      var s = getPrototypeOf(this).constructor;
+      e = Reflect.construct(o, arguments, s);
+    } else e = o.apply(this, arguments);
+    return possibleConstructorReturn(this, e);
+  };
+}
+export { _createSuper as default };