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/lamp.js

@@ -0,0 +1,17 @@
+/**
+ * @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 Lamp = createLucideIcon("Lamp", [
+  ["path", { d: "M8 2h8l4 10H4L8 2Z", key: "9dma5w" }],
+  ["path", { d: "M12 12v6", key: "3ahymv" }],
+  ["path", { d: "M8 22v-2c0-1.1.9-2 2-2h4a2 2 0 0 1 2 2v2H8Z", key: "mwf4oh" }]
+]);
+
+export { Lamp as default };
+//# sourceMappingURL=lamp.js.map