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/vitest/dist/vendor/run-once.Olz_Zkd8.js

@@ -0,0 +1,27 @@
+import { g as getWorkerState } from './global.CkGT_TMy.js';
+
+const filesCount = /* @__PURE__ */ new Map();
+const cache = /* @__PURE__ */ new Map();
+function runOnce(fn, key) {
+  const filepath = getWorkerState().filepath || "__unknown_files__";
+  if (!key) {
+    filesCount.set(filepath, (filesCount.get(filepath) || 0) + 1);
+    key = String(filesCount.get(filepath));
+  }
+  const id = `${filepath}:${key}`;
+  if (!cache.has(id))
+    cache.set(id, fn());
+  return cache.get(id);
+}
+function isFirstRun() {
+  let firstRun = false;
+  runOnce(() => {
+    firstRun = true;
+  }, "__vitest_first_run__");
+  return firstRun;
+}
+function resetRunOnceCounter() {
+  filesCount.clear();
+}
+
+export { runOnce as a, isFirstRun as i, resetRunOnceCounter as r };