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/sun-snow.js

@@ -0,0 +1,25 @@
+/**
+ * @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 SunSnow = createLucideIcon("SunSnow", [
+  ["path", { d: "M10 9a3 3 0 1 0 0 6", key: "6zmtdl" }],
+  ["path", { d: "M2 12h1", key: "1uaihz" }],
+  ["path", { d: "M14 21V3", key: "1llu3z" }],
+  ["path", { d: "M10 4V3", key: "pkzwkn" }],
+  ["path", { d: "M10 21v-1", key: "1u8rkd" }],
+  ["path", { d: "m3.64 18.36.7-.7", key: "105rm9" }],
+  ["path", { d: "m4.34 6.34-.7-.7", key: "d3unjp" }],
+  ["path", { d: "M14 12h8", key: "4f43i9" }],
+  ["path", { d: "m17 4-3 3", key: "15jcng" }],
+  ["path", { d: "m14 17 3 3", key: "6tlq38" }],
+  ["path", { d: "m21 15-3-3 3-3", key: "1nlnje" }]
+]);
+
+export { SunSnow as default };
+//# sourceMappingURL=sun-snow.js.map