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-audio.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 FileAudio = createLucideIcon("FileAudio", [
+  [
+    "path",
+    {
+      d: "M17.5 22h.5c.5 0 1-.2 1.4-.6.4-.4.6-.9.6-1.4V7.5L14.5 2H6c-.5 0-1 .2-1.4.6C4.2 3 4 3.5 4 4v3",
+      key: "1013sb"
+    }
+  ],
+  ["polyline", { points: "14 2 14 8 20 8", key: "1ew0cm" }],
+  ["path", { d: "M10 20v-1a2 2 0 1 1 4 0v1a2 2 0 1 1-4 0Z", key: "gqt63y" }],
+  ["path", { d: "M6 20v-1a2 2 0 1 0-4 0v1a2 2 0 1 0 4 0Z", key: "cf7lqx" }],
+  ["path", { d: "M2 19v-3a6 6 0 0 1 12 0v3", key: "1acxgf" }]
+]);
+
+export { FileAudio as default };
+//# sourceMappingURL=file-audio.js.map