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/haze.js

@@ -0,0 +1,22 @@
+/**
+ * @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 Haze = createLucideIcon("Haze", [
+  ["path", { d: "m5.2 6.2 1.4 1.4", key: "17imol" }],
+  ["path", { d: "M2 13h2", key: "13gyu8" }],
+  ["path", { d: "M20 13h2", key: "16rner" }],
+  ["path", { d: "m17.4 7.6 1.4-1.4", key: "t4xlah" }],
+  ["path", { d: "M22 17H2", key: "1gtaj3" }],
+  ["path", { d: "M22 21H2", key: "1gy6en" }],
+  ["path", { d: "M16 13a4 4 0 0 0-8 0", key: "1dyczq" }],
+  ["path", { d: "M12 5V2.5", key: "1vytko" }]
+]);
+
+export { Haze as default };
+//# sourceMappingURL=haze.js.map