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/file-archive.js

@@ -0,0 +1,26 @@
+/**
+ * @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 FileArchive = createLucideIcon("FileArchive", [
+  [
+    "path",
+    {
+      d: "M4 22V4c0-.5.2-1 .6-1.4C5 2.2 5.5 2 6 2h8.5L20 7.5V20c0 .5-.2 1-.6 1.4-.4.4-.9.6-1.4.6h-2",
+      key: "1u864v"
+    }
+  ],
+  ["polyline", { points: "14 2 14 8 20 8", key: "1ew0cm" }],
+  ["circle", { cx: "10", cy: "20", r: "2", key: "1xzdoj" }],
+  ["path", { d: "M10 7V6", key: "dljcrl" }],
+  ["path", { d: "M10 12v-1", key: "v7bkov" }],
+  ["path", { d: "M10 18v-2", key: "1cjy8d" }]
+]);
+
+export { FileArchive as default };
+//# sourceMappingURL=file-archive.js.map