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/resolve/lib/caller.js

@@ -0,0 +1,12 @@
+'use strict';
+
+var $Error = require('es-errors');
+
+module.exports = function () {
+    // see https://code.google.com/p/v8/wiki/JavaScriptStackTraceApi
+    var origPrepareStackTrace = $Error.prepareStackTrace;
+    $Error.prepareStackTrace = function (_, stack) { return stack; };
+    var stack = (new $Error()).stack;
+    $Error.prepareStackTrace = origPrepareStackTrace;
+    return stack[2].getFileName();
+};