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/file-text.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 FileText = createLucideIcon("FileText", [
+  [
+    "path",
+    { d: "M14.5 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V7.5L14.5 2z", key: "1nnpy2" }
+  ],
+  ["polyline", { points: "14 2 14 8 20 8", key: "1ew0cm" }],
+  ["line", { x1: "16", x2: "8", y1: "13", y2: "13", key: "14keom" }],
+  ["line", { x1: "16", x2: "8", y1: "17", y2: "17", key: "17nazh" }],
+  ["line", { x1: "10", x2: "8", y1: "9", y2: "9", key: "1a5vjj" }]
+]);
+
+export { FileText as default };
+//# sourceMappingURL=file-text.js.map