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/monitor-dot.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 MonitorDot = createLucideIcon("MonitorDot", [
+  ["circle", { cx: "19", cy: "6", r: "3", key: "108a5v" }],
+  ["path", { d: "M22 12v3a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h9", key: "1fet9y" }],
+  ["path", { d: "M12 17v4", key: "1riwvh" }],
+  ["path", { d: "M8 21h8", key: "1ev6f3" }]
+]);
+
+export { MonitorDot as default };
+//# sourceMappingURL=monitor-dot.js.map