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/ferris-wheel.js

@@ -0,0 +1,23 @@
+/**
+ * @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 FerrisWheel = createLucideIcon("FerrisWheel", [
+  ["circle", { cx: "12", cy: "12", r: "2", key: "1c9p78" }],
+  ["path", { d: "M12 2v4", key: "3427ic" }],
+  ["path", { d: "m6.8 15-3.5 2", key: "hjy98k" }],
+  ["path", { d: "m20.7 7-3.5 2", key: "f08gto" }],
+  ["path", { d: "M6.8 9 3.3 7", key: "1aevh4" }],
+  ["path", { d: "m20.7 17-3.5-2", key: "1liqo3" }],
+  ["path", { d: "m9 22 3-8 3 8", key: "wees03" }],
+  ["path", { d: "M8 22h8", key: "rmew8v" }],
+  ["path", { d: "M18 18.7a9 9 0 1 0-12 0", key: "dhzg4g" }]
+]);
+
+export { FerrisWheel as default };
+//# sourceMappingURL=ferris-wheel.js.map