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/css-tree/cjs/syntax/scope/index.cjs

@@ -0,0 +1,11 @@
+'use strict';
+
+const atrulePrelude = require('./atrulePrelude.cjs');
+const selector = require('./selector.cjs');
+const value = require('./value.cjs');
+
+
+
+exports.AtrulePrelude = atrulePrelude;
+exports.Selector = selector;
+exports.Value = value;