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/trending-up.js

@@ -0,0 +1,16 @@
+/**
+ * @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 TrendingUp = createLucideIcon("TrendingUp", [
+  ["polyline", { points: "22 7 13.5 15.5 8.5 10.5 2 17", key: "126l90" }],
+  ["polyline", { points: "16 7 22 7 22 13", key: "kwv8wd" }]
+]);
+
+export { TrendingUp as default };
+//# sourceMappingURL=trending-up.js.map