fix: address PR review findings

- Revert undici to v7.27.1 (v8 blocked by #5467 qBittorrent regression)
- Broaden cache invalidation to utils.integration.invalidate() (covers
  all integration queries, not just integration.all)
- Add invalidation to onboarding integration create path
- Harden renovate test to assert allowBuilds key exists
- Remove deprecated Vitest 4 poolOptions config
- Fix CSS typo in docs menu transition (0.s → 0.5s)
- Update renovate.json5 comment to reference allowBuilds

apps/docs/src/css/custom.css

@@ -93,7 +93,7 @@
 }
 
 .menu__list {
-  transition: all 0.s ease-in-out !important;
+  transition: all 0.5s ease-in-out !important;
 }
 
 .announcementBar_node_modules-\@docusaurus-theme-classic-lib-theme-AnnouncementBar-styles-module {