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/config/parser-selector.cjs

@@ -0,0 +1,19 @@
+'use strict';
+
+const index = require('../pseudo/index.cjs');
+const indexParseSelector = require('../node/index-parse-selector.cjs');
+const selector = require('../scope/selector.cjs');
+
+const config = {
+    parseContext: {
+        default: 'SelectorList',
+        selectorList: 'SelectorList',
+        selector: 'Selector'
+    },
+    scope: { Selector: selector },
+    atrule: {},
+    pseudo: index,
+    node: indexParseSelector
+};
+
+module.exports = config;