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/alarm-clock-check.js

@@ -0,0 +1,20 @@
+/**
+ * @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 AlarmClockCheck = createLucideIcon("AlarmClockCheck", [
+  ["circle", { cx: "12", cy: "13", r: "8", key: "3y4lt7" }],
+  ["path", { d: "M5 3 2 6", key: "18tl5t" }],
+  ["path", { d: "m22 6-3-3", key: "1opdir" }],
+  ["path", { d: "M6.38 18.7 4 21", key: "17xu3x" }],
+  ["path", { d: "M17.64 18.67 20 21", key: "kv2oe2" }],
+  ["path", { d: "m9 13 2 2 4-4", key: "6343dt" }]
+]);
+
+export { AlarmClockCheck as default };
+//# sourceMappingURL=alarm-clock-check.js.map