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/goal.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 Goal = createLucideIcon("Goal", [
+  ["path", { d: "M12 13V2l8 4-8 4", key: "5wlwwj" }],
+  ["path", { d: "M20.55 10.23A9 9 0 1 1 8 4.94", key: "5988i3" }],
+  ["path", { d: "M8 10a5 5 0 1 0 8.9 2.02", key: "1hq7ot" }]
+]);
+
+export { Goal as default };
+//# sourceMappingURL=goal.js.map