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/payload/getUniqPayload.js

@@ -0,0 +1,20 @@
+import uniqBy from 'lodash/uniqBy';
+import isFunction from 'lodash/isFunction';
+
+/**
+ * This is configuration option that decides how to filter for unique values only:
+ *
+ * - `false` means "no filter"
+ * - `true` means "use recharts default filter"
+ * - function means "use return of this function as the default key"
+ */
+
+export function getUniqPayload(payload, option, defaultUniqBy) {
+  if (option === true) {
+    return uniqBy(payload, defaultUniqBy);
+  }
+  if (isFunction(option)) {
+    return uniqBy(payload, option);
+  }
+  return payload;
+}