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/package-open.js

@@ -0,0 +1,36 @@
+/**
+ * @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 PackageOpen = createLucideIcon("PackageOpen", [
+  [
+    "path",
+    {
+      d: "M20.91 8.84 8.56 2.23a1.93 1.93 0 0 0-1.81 0L3.1 4.13a2.12 2.12 0 0 0-.05 3.69l12.22 6.93a2 2 0 0 0 1.94 0L21 12.51a2.12 2.12 0 0 0-.09-3.67Z",
+      key: "1vy178"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "m3.09 8.84 12.35-6.61a1.93 1.93 0 0 1 1.81 0l3.65 1.9a2.12 2.12 0 0 1 .1 3.69L8.73 14.75a2 2 0 0 1-1.94 0L3 12.51a2.12 2.12 0 0 1 .09-3.67Z",
+      key: "s3bv25"
+    }
+  ],
+  ["line", { x1: "12", x2: "12", y1: "22", y2: "13", key: "1o4xyi" }],
+  [
+    "path",
+    {
+      d: "M20 13.5v3.37a2.06 2.06 0 0 1-1.11 1.83l-6 3.08a1.93 1.93 0 0 1-1.78 0l-6-3.08A2.06 2.06 0 0 1 4 16.87V13.5",
+      key: "1na2nq"
+    }
+  ]
+]);
+
+export { PackageOpen as default };
+//# sourceMappingURL=package-open.js.map