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/siren.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 Siren = createLucideIcon("Siren", [
+  ["path", { d: "M7 12a5 5 0 0 1 5-5v0a5 5 0 0 1 5 5v6H7v-6Z", key: "rmc51c" }],
+  ["path", { d: "M5 20a2 2 0 0 1 2-2h10a2 2 0 0 1 2 2v2H5v-2Z", key: "yyvmjy" }],
+  ["path", { d: "M21 12h1", key: "jtio3y" }],
+  ["path", { d: "M18.5 4.5 18 5", key: "g5sp9y" }],
+  ["path", { d: "M2 12h1", key: "1uaihz" }],
+  ["path", { d: "M12 2v1", key: "11qlp1" }],
+  ["path", { d: "m4.929 4.929.707.707", key: "1i51kw" }],
+  ["path", { d: "M12 12v6", key: "3ahymv" }]
+]);
+
+export { Siren as default };
+//# sourceMappingURL=siren.js.map