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/file-badge.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 FileBadge = createLucideIcon("FileBadge", [
+  ["path", { d: "M4 7V4a2 2 0 0 1 2-2h8.5L20 7.5V20a2 2 0 0 1-2 2h-6", key: "qtddq0" }],
+  ["polyline", { points: "14 2 14 8 20 8", key: "1ew0cm" }],
+  ["path", { d: "M5 17a3 3 0 1 0 0-6 3 3 0 0 0 0 6Z", key: "u0c8gj" }],
+  ["path", { d: "M7 16.5 8 22l-3-1-3 1 1-5.5", key: "5gm2nr" }]
+]);
+
+export { FileBadge as default };
+//# sourceMappingURL=file-badge.js.map