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/cloud-moon-rain.js

@@ -0,0 +1,24 @@
+/**
+ * @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 CloudMoonRain = createLucideIcon("CloudMoonRain", [
+  [
+    "path",
+    {
+      d: "M10.083 9A6.002 6.002 0 0 1 16 4a4.243 4.243 0 0 0 6 6c0 2.22-1.206 4.16-3 5.197",
+      key: "u82z8m"
+    }
+  ],
+  ["path", { d: "M3 20a5 5 0 1 1 8.9-4H13a3 3 0 0 1 2 5.24", key: "1qmrp3" }],
+  ["path", { d: "M11 20v2", key: "174qtz" }],
+  ["path", { d: "M7 19v2", key: "12npes" }]
+]);
+
+export { CloudMoonRain as default };
+//# sourceMappingURL=cloud-moon-rain.js.map