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/es-get-iterator/test/node.mjs

@@ -0,0 +1,10 @@
+import getIterator from 'es-get-iterator';
+import Module from 'module';
+
+const require = Module.createRequire(import.meta.url);
+const id = require.resolve('../node');
+const mod = new Module(id);
+mod.exports = getIterator;
+require.cache[id] = mod;
+
+require('./');