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/paint-bucket.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 PaintBucket = createLucideIcon("PaintBucket", [
+  [
+    "path",
+    { d: "m19 11-8-8-8.6 8.6a2 2 0 0 0 0 2.8l5.2 5.2c.8.8 2 .8 2.8 0L19 11Z", key: "irua1i" }
+  ],
+  ["path", { d: "m5 2 5 5", key: "1lls2c" }],
+  ["path", { d: "M2 13h15", key: "1hkzvu" }],
+  ["path", { d: "M22 20a2 2 0 1 1-4 0c0-1.6 1.7-2.4 2-4 .3 1.6 2 2.4 2 4Z", key: "xk76lq" }]
+]);
+
+export { PaintBucket as default };
+//# sourceMappingURL=paint-bucket.js.map