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/lz-string/bower.json

@@ -0,0 +1,11 @@
+{
+  "name": "lz-string",
+  "version": "1.4.5",
+  "main": "libs/lz-string.min.js",
+  "ignore": [
+    "bin/",
+    "reference/",
+    "tests/"
+  ],
+  "keywords": ["compression", "lzw", "string"]
+}