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/sticker.js

@@ -0,0 +1,22 @@
+/**
+ * @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 Sticker = createLucideIcon("Sticker", [
+  [
+    "path",
+    { d: "M15.5 3H5a2 2 0 0 0-2 2v14c0 1.1.9 2 2 2h14a2 2 0 0 0 2-2V8.5L15.5 3Z", key: "1wis1t" }
+  ],
+  ["path", { d: "M15 3v6h6", key: "edgan2" }],
+  ["path", { d: "M10 16s.8 1 2 1c1.3 0 2-1 2-1", key: "1vvgv3" }],
+  ["path", { d: "M8 13h0", key: "jdup5h" }],
+  ["path", { d: "M16 13h0", key: "l4i2ga" }]
+]);
+
+export { Sticker as default };
+//# sourceMappingURL=sticker.js.map