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/printer.js

@@ -0,0 +1,23 @@
+/**
+ * @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 Printer = createLucideIcon("Printer", [
+  ["polyline", { points: "6 9 6 2 18 2 18 9", key: "1306q4" }],
+  [
+    "path",
+    {
+      d: "M6 18H4a2 2 0 0 1-2-2v-5a2 2 0 0 1 2-2h16a2 2 0 0 1 2 2v5a2 2 0 0 1-2 2h-2",
+      key: "143wyd"
+    }
+  ],
+  ["rect", { width: "12", height: "8", x: "6", y: "14", key: "5ipwut" }]
+]);
+
+export { Printer as default };
+//# sourceMappingURL=printer.js.map