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/battery-full.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 BatteryFull = createLucideIcon("BatteryFull", [
+  ["rect", { width: "16", height: "10", x: "2", y: "7", rx: "2", ry: "2", key: "1w10f2" }],
+  ["line", { x1: "22", x2: "22", y1: "11", y2: "13", key: "4dh1rd" }],
+  ["line", { x1: "6", x2: "6", y1: "11", y2: "13", key: "1wd6dw" }],
+  ["line", { x1: "10", x2: "10", y1: "11", y2: "13", key: "haxvl5" }],
+  ["line", { x1: "14", x2: "14", y1: "11", y2: "13", key: "c6fn6x" }]
+]);
+
+export { BatteryFull as default };
+//# sourceMappingURL=battery-full.js.map