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/lucide-react/dist/esm/icons/align-start-horizontal.js

@@ -0,0 +1,17 @@
+/**
+ * @license lucide-react v0.303.0 - ISC
+ *
+ * This source code is licensed under the ISC license.
+ * See the LICENSE file in the root directory of this source tree.
+ */
+
+import createLucideIcon from '../createLucideIcon.js';
+
+const AlignStartHorizontal = createLucideIcon("AlignStartHorizontal", [
+  ["rect", { width: "6", height: "16", x: "4", y: "6", rx: "2", key: "1n4dg1" }],
+  ["rect", { width: "6", height: "9", x: "14", y: "6", rx: "2", key: "17khns" }],
+  ["path", { d: "M22 2H2", key: "fhrpnj" }]
+]);
+
+export { AlignStartHorizontal as default };
+//# sourceMappingURL=align-start-horizontal.js.map