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/pointer.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 Pointer = createLucideIcon("Pointer", [
+  ["path", { d: "M22 14a8 8 0 0 1-8 8", key: "56vcr3" }],
+  ["path", { d: "M18 11v-1a2 2 0 0 0-2-2v0a2 2 0 0 0-2 2v0", key: "1pp0yd" }],
+  ["path", { d: "M14 10V9a2 2 0 0 0-2-2v0a2 2 0 0 0-2 2v1", key: "u654g" }],
+  ["path", { d: "M10 9.5V4a2 2 0 0 0-2-2v0a2 2 0 0 0-2 2v10", key: "1e2dtv" }],
+  [
+    "path",
+    {
+      d: "M18 11a2 2 0 1 1 4 0v3a8 8 0 0 1-8 8h-2c-2.8 0-4.5-.86-5.99-2.34l-3.6-3.6a2 2 0 0 1 2.83-2.82L7 15",
+      key: "g6ys72"
+    }
+  ]
+]);
+
+export { Pointer as default };
+//# sourceMappingURL=pointer.js.map