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>

scripts/run-qemu.sh

@@ -6,6 +6,7 @@
 #   --disk    attach out/qemu/disk.qcow2 (20 GB, created on first use) to test installing
 #   --serial  no window: the serial console in this terminal (server ISO), Ctrl-A X quits
 # Without a path the newest desktop ISO in out/iso is used (server ISO with --serial).
+# The guest's SSH is on localhost:2222 (DASOS_SSH_PORT changes it): ssh -p 2222 user@localhost
 set -euo pipefail
 
 root=$(cd "$(dirname "$0")/.." && pwd)
@@ -13,6 +14,7 @@ state=$root/out/qemu
 firmware=uefi
 disk=false
 serial=false
+ssh_port=${DASOS_SSH_PORT:-2222}
 iso=""
 
 die() {
@@ -43,7 +45,7 @@ fi
 
 args=(
   -machine q35 -smp 4 -m 4096
-  -device virtio-net-pci,netdev=net0 -netdev user,id=net0
+  -device virtio-net-pci,netdev=net0 -netdev "user,id=net0,hostfwd=tcp:127.0.0.1:${ssh_port}-:22"
   -cdrom "$iso" -boot order=d
 )
 if [[ $serial == true ]]; then