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/pretty-format/build/index.d.ts

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+import type { NewPlugin, Options, OptionsReceived } from './types';
+export type { Colors, CompareKeys, Config, Options, OptionsReceived, OldPlugin, NewPlugin, Plugin, Plugins, PrettyFormatOptions, Printer, Refs, Theme, } from './types';
+export declare const DEFAULT_OPTIONS: Options;
+/**
+ * Returns a presentation string of your `val` object
+ * @param val any potential JavaScript object
+ * @param options Custom settings
+ */
+export declare function format(val: unknown, options?: OptionsReceived): string;
+export declare const plugins: {
+    AsymmetricMatcher: NewPlugin;
+    ConvertAnsi: NewPlugin;
+    DOMCollection: NewPlugin;
+    DOMElement: NewPlugin;
+    Immutable: NewPlugin;
+    ReactElement: NewPlugin;
+    ReactTestComponent: NewPlugin;
+};
+export default format;