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/route-off.js

@@ -0,0 +1,21 @@
+/**
+ * @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 RouteOff = createLucideIcon("RouteOff", [
+  ["circle", { cx: "6", cy: "19", r: "3", key: "1kj8tv" }],
+  ["path", { d: "M9 19h8.5c.4 0 .9-.1 1.3-.2", key: "1effex" }],
+  ["path", { d: "M5.2 5.2A3.5 3.53 0 0 0 6.5 12H12", key: "k9y2ds" }],
+  ["path", { d: "m2 2 20 20", key: "1ooewy" }],
+  ["path", { d: "M21 15.3a3.5 3.5 0 0 0-3.3-3.3", key: "11nlu2" }],
+  ["path", { d: "M15 5h-4.3", key: "6537je" }],
+  ["circle", { cx: "18", cy: "5", r: "3", key: "gq8acd" }]
+]);
+
+export { RouteOff as default };
+//# sourceMappingURL=route-off.js.map