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/fast-glob/out/providers/async.d.ts

@@ -0,0 +1,9 @@
+import { Task } from '../managers/tasks';
+import { Entry, EntryItem, ReaderOptions } from '../types';
+import ReaderAsync from '../readers/async';
+import Provider from './provider';
+export default class ProviderAsync extends Provider<Promise<EntryItem[]>> {
+    protected _reader: ReaderAsync;
+    read(task: Task): Promise<EntryItem[]>;
+    api(root: string, task: Task, options: ReaderOptions): Promise<Entry[]>;
+}