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/hammer.js

@@ -0,0 +1,26 @@
+/**
+ * @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 Hammer = createLucideIcon("Hammer", [
+  [
+    "path",
+    { d: "m15 12-8.5 8.5c-.83.83-2.17.83-3 0 0 0 0 0 0 0a2.12 2.12 0 0 1 0-3L12 9", key: "1afvon" }
+  ],
+  ["path", { d: "M17.64 15 22 10.64", key: "zsji6s" }],
+  [
+    "path",
+    {
+      d: "m20.91 11.7-1.25-1.25c-.6-.6-.93-1.4-.93-2.25v-.86L16.01 4.6a5.56 5.56 0 0 0-3.94-1.64H9l.92.82A6.18 6.18 0 0 1 12 8.4v1.56l2 2h2.47l2.26 1.91",
+      key: "lehyy1"
+    }
+  ]
+]);
+
+export { Hammer as default };
+//# sourceMappingURL=hammer.js.map