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/creative-commons.js

@@ -0,0 +1,23 @@
+/**
+ * @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 CreativeCommons = createLucideIcon("CreativeCommons", [
+  ["circle", { cx: "12", cy: "12", r: "10", key: "1mglay" }],
+  [
+    "path",
+    { d: "M10 9.3a2.8 2.8 0 0 0-3.5 1 3.1 3.1 0 0 0 0 3.4 2.7 2.7 0 0 0 3.5 1", key: "1ss3eq" }
+  ],
+  [
+    "path",
+    { d: "M17 9.3a2.8 2.8 0 0 0-3.5 1 3.1 3.1 0 0 0 0 3.4 2.7 2.7 0 0 0 3.5 1", key: "1od56t" }
+  ]
+]);
+
+export { CreativeCommons as default };
+//# sourceMappingURL=creative-commons.js.map