Terminal: Das prompt, dprompt and dbanner (0.9.1)

- das-shell 0.1.0: the Das two-line bash prompt by default (replaces the
  PS1 of Void's skel .bashrc once), dprompt (Textual prompt builder with
  presets and live preview) and dbanner (SSH login banner editor: canvas
  tools, fields with values, widgets, das-banner service for cached ones,
  Das OS logo and tryzub pictures). Python tests in make test.
- das-server 0.3.0 depends on das-shell; the server installer mentions
  dprompt and dbanner; the desktop image includes it.
- run-qemu.sh forwards the guest's SSH to localhost:2222.
- Hardware fixes: Ventoy menu icon, boot menu titles "Das OS <version>".

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

srcpkgs/das-shell/files/share/banner/widgets/lastlog.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+# dbanner-title-uk: Попередній вхід
+# dbanner-title-en: Previous login
+# dbanner-mode: live
+# The login before this one of the user who logs in (from last).
+. "${0%/*}/lib.sh"
+command -v last >/dev/null || exit 0
+user=${USER:-$(id -un)}
+line=$(timeout 1 last -n 2 -w --time-format iso "$user" 2>/dev/null | sed -n 2p)
+[[ -n $line && $line != wtmp* ]] || exit 0
+read -r _ tty from when _ <<<"$line"
+[[ $from == :* || $from =~ ^tty ]] && from=$tty
+echo "$Bold$(say "Попередній вхід:" "Previous login:")$Off ${when%+*} $(say "з" "from") $Cyan$from$Off"