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/satellite.js

@@ -0,0 +1,19 @@
+/**
+ * @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 Satellite = createLucideIcon("Satellite", [
+  ["path", { d: "M13 7 9 3 5 7l4 4", key: "vyckw6" }],
+  ["path", { d: "m17 11 4 4-4 4-4-4", key: "rchckc" }],
+  ["path", { d: "m8 12 4 4 6-6-4-4Z", key: "1sshf7" }],
+  ["path", { d: "m16 8 3-3", key: "x428zp" }],
+  ["path", { d: "M9 21a6 6 0 0 0-6-6", key: "1iajcf" }]
+]);
+
+export { Satellite as default };
+//# sourceMappingURL=satellite.js.map