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/watch.js

@@ -0,0 +1,21 @@
+/**
+ * @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 Watch = createLucideIcon("Watch", [
+  ["circle", { cx: "12", cy: "12", r: "6", key: "1vlfrh" }],
+  ["polyline", { points: "12 10 12 12 13 13", key: "19dquz" }],
+  [
+    "path",
+    { d: "m16.13 7.66-.81-4.05a2 2 0 0 0-2-1.61h-2.68a2 2 0 0 0-2 1.61l-.78 4.05", key: "18k57s" }
+  ],
+  ["path", { d: "m7.88 16.36.8 4a2 2 0 0 0 2 1.61h2.72a2 2 0 0 0 2-1.61l.81-4.05", key: "16ny36" }]
+]);
+
+export { Watch as default };
+//# sourceMappingURL=watch.js.map