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/lib/tokenizer/names.js

@@ -0,0 +1,27 @@
+export default [
+    'EOF-token',
+    'ident-token',
+    'function-token',
+    'at-keyword-token',
+    'hash-token',
+    'string-token',
+    'bad-string-token',
+    'url-token',
+    'bad-url-token',
+    'delim-token',
+    'number-token',
+    'percentage-token',
+    'dimension-token',
+    'whitespace-token',
+    'CDO-token',
+    'CDC-token',
+    'colon-token',
+    'semicolon-token',
+    'comma-token',
+    '[-token',
+    ']-token',
+    '(-token',
+    ')-token',
+    '{-token',
+    '}-token'
+];