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/helping-hand.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 HelpingHand = createLucideIcon("HelpingHand", [
+  [
+    "path",
+    {
+      d: "m3 15 5.12-5.12A3 3 0 0 1 10.24 9H13a2 2 0 1 1 0 4h-2.5m4-.68 4.17-4.89a1.88 1.88 0 0 1 2.92 2.36l-4.2 5.94A3 3 0 0 1 14.96 17H9.83a2 2 0 0 0-1.42.59L7 19",
+      key: "nitrv7"
+    }
+  ],
+  ["path", { d: "m2 14 6 6", key: "g6j1uo" }]
+]);
+
+export { HelpingHand as default };
+//# sourceMappingURL=helping-hand.js.map