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/fast-glob/out/utils/string.js

@@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.isEmpty = exports.isString = void 0;
+function isString(input) {
+    return typeof input === 'string';
+}
+exports.isString = isString;
+function isEmpty(input) {
+    return input === '';
+}
+exports.isEmpty = isEmpty;