NFS-aware .bashrc.local and VS Code dirs for work servers

- Remove zet* from _is_work_host (local git server, not a work host)
- setup_enterprise_ai_bash.sh: detect NFS home on work servers, relocate
  .bashrc.local to /opt/kenjim/ with symlink, handle re-runs safely
- setup_enterprise_ai_bash.sh: symlink ~/.vscode-server and
  ~/.vscode-remote-containers to /opt/kenjim/ on NFS hosts
- dotfiles_manager.sh: deploy-to detects NFS on remote, deploys
  .bashrc.local to /opt/kenjim/ with symlink, backs up symlink targets
- hosts/etqc-kenjim-11.bashrc.local: add NFS note to header

.bashrc.d/30_work.sh

@@ -14,7 +14,7 @@ _is_work_host() {
     [[ "${MACHINE_PROFILE:-}" == "work" ]] && return 0
     # Fallback hostname pattern for work servers where .bashrc.local may not exist
     case "$(hostname -s)" in
-        kenjim-mbp*|etqc-*|etbg-*|engtech-dev-*|zet*) return 0 ;;
+        kenjim-mbp*|etqc-*|etbg-*|engtech-dev-*) return 0 ;;
         *) return 1 ;;
     esac
 }