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/autoprefixer/lib/hacks/display-grid.js

@@ -0,0 +1,21 @@
+let Value = require('../value')
+
+class DisplayGrid extends Value {
+  constructor(name, prefixes) {
+    super(name, prefixes)
+    if (name === 'display-grid') {
+      this.name = 'grid'
+    }
+  }
+
+  /**
+   * Faster check for flex value
+   */
+  check(decl) {
+    return decl.prop === 'display' && decl.value === this.name
+  }
+}
+
+DisplayGrid.names = ['display-grid', 'inline-grid']
+
+module.exports = DisplayGrid