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/image-down.js

@@ -0,0 +1,19 @@
+/**
+ * @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 ImageDown = createLucideIcon("ImageDown", [
+  ["circle", { cx: "9", cy: "9", r: "2", key: "af1f0g" }],
+  ["path", { d: "M10.3 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2v10.8", key: "sqts6f" }],
+  ["path", { d: "m21 15-3.1-3.1a2 2 0 0 0-2.814.014L6 21", key: "1h47z9" }],
+  ["path", { d: "m14 19.5 3 3v-6", key: "1x9jmo" }],
+  ["path", { d: "m17 22.5 3-3", key: "xzuz0n" }]
+]);
+
+export { ImageDown as default };
+//# sourceMappingURL=image-down.js.map