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/chai/bower.json

@@ -0,0 +1,26 @@
+{
+  "name": "chai",
+  "description": "BDD/TDD assertion library for node.js and the browser. Test framework agnostic.",
+  "license": "MIT",
+  "keywords": [
+    "test",
+    "assertion",
+    "assert",
+    "testing",
+    "chai"
+  ],
+  "main": "chai.js",
+  "ignore": [
+    "build",
+    "components",
+    "lib",
+    "node_modules",
+    "support",
+    "test",
+    "index.js",
+    "Makefile",
+    ".*"
+  ],
+  "dependencies": {},
+  "devDependencies": {}
+}