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/iteration-ccw.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 IterationCcw = createLucideIcon("IterationCcw", [
+  ["path", { d: "M20 10c0-4.4-3.6-8-8-8s-8 3.6-8 8 3.6 8 8 8h8", key: "4znkd0" }],
+  ["polyline", { points: "16 14 20 18 16 22", key: "11njsm" }]
+]);
+
+export { IterationCcw as default };
+//# sourceMappingURL=iteration-ccw.js.map