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/sparkles.js

@@ -0,0 +1,25 @@
+/**
+ * @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 Sparkles = createLucideIcon("Sparkles", [
+  [
+    "path",
+    {
+      d: "m12 3-1.912 5.813a2 2 0 0 1-1.275 1.275L3 12l5.813 1.912a2 2 0 0 1 1.275 1.275L12 21l1.912-5.813a2 2 0 0 1 1.275-1.275L21 12l-5.813-1.912a2 2 0 0 1-1.275-1.275L12 3Z",
+      key: "17u4zn"
+    }
+  ],
+  ["path", { d: "M5 3v4", key: "bklmnn" }],
+  ["path", { d: "M19 17v4", key: "iiml17" }],
+  ["path", { d: "M3 5h4", key: "nem4j1" }],
+  ["path", { d: "M17 19h4", key: "lbex7p" }]
+]);
+
+export { Sparkles as default };
+//# sourceMappingURL=sparkles.js.map