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/why-is-node-running/example.js

@@ -0,0 +1,15 @@
+var log = require('./')
+var net = require('net')
+
+function createServer () {
+  var server = net.createServer()
+  setInterval(function () {}, 1000)
+  server.listen(0)
+}
+
+createServer()
+createServer()
+
+setTimeout(function () {
+  log()
+}, 100)