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/@tanstack/react-query/build/modern/useSuspenseQuery.js

@@ -0,0 +1,28 @@
+"use client";
+
+// src/useSuspenseQuery.ts
+import { QueryObserver, skipToken } from "@tanstack/query-core";
+import { useBaseQuery } from "./useBaseQuery.js";
+import { defaultThrowOnError } from "./suspense.js";
+function useSuspenseQuery(options, queryClient) {
+  if (process.env.NODE_ENV !== "production") {
+    if (options.queryFn === skipToken) {
+      console.error("skipToken is not allowed for useSuspenseQuery");
+    }
+  }
+  return useBaseQuery(
+    {
+      ...options,
+      enabled: true,
+      suspense: true,
+      throwOnError: defaultThrowOnError,
+      placeholderData: void 0
+    },
+    QueryObserver,
+    queryClient
+  );
+}
+export {
+  useSuspenseQuery
+};
+//# sourceMappingURL=useSuspenseQuery.js.map