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/baggage-claim.js

@@ -0,0 +1,19 @@
+/**
+ * @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 BaggageClaim = createLucideIcon("BaggageClaim", [
+  ["path", { d: "M22 18H6a2 2 0 0 1-2-2V7a2 2 0 0 0-2-2", key: "4irg2o" }],
+  ["path", { d: "M17 14V4a2 2 0 0 0-2-2h-1a2 2 0 0 0-2 2v10", key: "14fcyx" }],
+  ["rect", { width: "13", height: "8", x: "8", y: "6", rx: "1", key: "o6oiis" }],
+  ["circle", { cx: "18", cy: "20", r: "2", key: "t9985n" }],
+  ["circle", { cx: "9", cy: "20", r: "2", key: "e5v82j" }]
+]);
+
+export { BaggageClaim as default };
+//# sourceMappingURL=baggage-claim.js.map