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/any-promise/register-shim.js

@@ -0,0 +1,18 @@
+"use strict";
+module.exports = require('./loader')(window, loadImplementation)
+
+/**
+ * Browser specific loadImplementation.  Always uses `window.Promise`
+ *
+ * To register a custom implementation, must register with `Promise` option.
+ */
+function loadImplementation(){
+  if(typeof window.Promise === 'undefined'){
+    throw new Error("any-promise browser requires a polyfill or explicit registration"+
+      " e.g: require('any-promise/register/bluebird')")
+  }
+  return {
+    Promise: window.Promise,
+    implementation: 'window.Promise'
+  }
+}