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/rocking-chair.js

@@ -0,0 +1,18 @@
+/**
+ * @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 RockingChair = createLucideIcon("RockingChair", [
+  ["polyline", { points: "3.5 2 6.5 12.5 18 12.5", key: "y3iy52" }],
+  ["line", { x1: "9.5", x2: "5.5", y1: "12.5", y2: "20", key: "19vg5i" }],
+  ["line", { x1: "15", x2: "18.5", y1: "12.5", y2: "20", key: "1inpmv" }],
+  ["path", { d: "M2.75 18a13 13 0 0 0 18.5 0", key: "1nquas" }]
+]);
+
+export { RockingChair as default };
+//# sourceMappingURL=rocking-chair.js.map