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/package-2.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 Package2 = createLucideIcon("Package2", [
+  ["path", { d: "M3 9h18v10a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V9Z", key: "1ront0" }],
+  ["path", { d: "m3 9 2.45-4.9A2 2 0 0 1 7.24 3h9.52a2 2 0 0 1 1.8 1.1L21 9", key: "19h2x1" }],
+  ["path", { d: "M12 3v6", key: "1holv5" }]
+]);
+
+export { Package2 as default };
+//# sourceMappingURL=package-2.js.map