Jumoo.TranslationManager.AI: branch cleanup and v17.4.2/v18.1.1 releases

Repo: Jumoo/Jumoo.TranslationManager.AI

Audited v17/main vs v18/main for fixes that hadn't made it across — everything was already synced via prior sync PRs, nothing to port
Deleted merged/obsolete branches: v17/batch-memory (local+remote) and a stray leftover origin/main from before the version-per-branch split
Released v17.4.2 to NuGet
Released v18.1.1 to NuGet