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/prompt/presets/classic.json

@@ -0,0 +1,16 @@
+{
+  "name": "classic",
+  "title": {"uk": "Класичне Void: [user@host dir]$", "en": "Classic Void: [user@host dir]$"},
+  "frame": "plain",
+  "open": "",
+  "close": "",
+  "sep": "",
+  "segments": [
+    {"type": "text", "text": "["},
+    {"type": "userhost", "fg": null, "at_fg": null, "at_bold": false, "host_fg": null, "host_bold": false, "root_fg": null, "root_bold": false},
+    {"type": "text", "text": " "},
+    {"type": "cwd", "mode": "base", "fg": null},
+    {"type": "text", "text": "]"},
+    {"type": "symbol", "fg": null}
+  ]
+}