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/save-all.js

@@ -0,0 +1,18 @@
+/**
+ * @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 SaveAll = createLucideIcon("SaveAll", [
+  ["path", { d: "M6 4a2 2 0 0 1 2-2h10l4 4v10.2a2 2 0 0 1-2 1.8H8a2 2 0 0 1-2-2Z", key: "1unput" }],
+  ["path", { d: "M10 2v4h6", key: "1p5sg6" }],
+  ["path", { d: "M18 18v-7h-8v7", key: "1oniuk" }],
+  ["path", { d: "M18 22H4a2 2 0 0 1-2-2V6", key: "pblm9e" }]
+]);
+
+export { SaveAll as default };
+//# sourceMappingURL=save-all.js.map