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/brain-circuit.js

@@ -0,0 +1,29 @@
+/**
+ * @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 BrainCircuit = createLucideIcon("BrainCircuit", [
+  [
+    "path",
+    {
+      d: "M12 4.5a2.5 2.5 0 0 0-4.96-.46 2.5 2.5 0 0 0-1.98 3 2.5 2.5 0 0 0-1.32 4.24 3 3 0 0 0 .34 5.58 2.5 2.5 0 0 0 2.96 3.08 2.5 2.5 0 0 0 4.91.05L12 20V4.5Z",
+      key: "ixwj2a"
+    }
+  ],
+  ["path", { d: "M16 8V5c0-1.1.9-2 2-2", key: "13dx7u" }],
+  ["path", { d: "M12 13h4", key: "1ku699" }],
+  ["path", { d: "M12 18h6a2 2 0 0 1 2 2v1", key: "105ag5" }],
+  ["path", { d: "M12 8h8", key: "1lhi5i" }],
+  ["path", { d: "M20.5 8a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0Z", key: "1s25gz" }],
+  ["path", { d: "M16.5 13a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0Z", key: "127460" }],
+  ["path", { d: "M20.5 21a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0Z", key: "fys062" }],
+  ["path", { d: "M18.5 3a.5.5 0 1 1-1 0 .5.5 0 0 1 1 0Z", key: "1vib61" }]
+]);
+
+export { BrainCircuit as default };
+//# sourceMappingURL=brain-circuit.js.map