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/presets/double.json

@@ -0,0 +1,130 @@
+{
+  "name": "double",
+  "title": {
+    "uk": "Подвійна рамка з великим ім'ям сервера",
+    "en": "Double frame with the server name in big letters"
+  },
+  "local": false,
+  "vars": {
+    "title": "Das OS Server",
+    "url": ""
+  },
+  "fields": [
+    {
+      "x": 2,
+      "y": 1,
+      "width": 60,
+      "align": "center",
+      "text": "{hostname}",
+      "style": "c",
+      "font": "small"
+    },
+    {
+      "x": 2,
+      "y": 5,
+      "width": 60,
+      "align": "center",
+      "text": "{title}",
+      "style": "d"
+    },
+    {
+      "x": 2,
+      "y": 6,
+      "width": 60,
+      "align": "center",
+      "text": "{url}",
+      "style": "e"
+    },
+    {
+      "x": 2,
+      "y": 8,
+      "width": 60,
+      "align": "center",
+      "text": "IP {ip}  ·  {os}  ·  {kernel}",
+      "style": "f"
+    }
+  ],
+  "widgets_position": "below",
+  "widgets": [
+    {
+      "type": "builtin",
+      "name": "uptime"
+    },
+    {
+      "type": "builtin",
+      "name": "load"
+    },
+    {
+      "type": "builtin",
+      "name": "memory"
+    },
+    {
+      "type": "builtin",
+      "name": "disks"
+    },
+    {
+      "type": "builtin",
+      "name": "services"
+    }
+  ],
+  "styles": {
+    "a": {
+      "fg": "cyan",
+      "bg": null,
+      "bold": true
+    },
+    "b": {
+      "fg": "bright_black",
+      "bg": null,
+      "bold": false
+    },
+    "c": {
+      "fg": "bright_white",
+      "bg": null,
+      "bold": true
+    },
+    "d": {
+      "fg": "yellow",
+      "bg": null,
+      "bold": true
+    },
+    "e": {
+      "fg": "cyan",
+      "bg": null,
+      "bold": false
+    },
+    "f": {
+      "fg": "white",
+      "bg": null,
+      "bold": false
+    }
+  },
+  "lines": [
+    "╔══════════════════════════════════════════════════════════════╗",
+    "║                                                              ║",
+    "║                                                              ║",
+    "║                                                              ║",
+    "║                                                              ║",
+    "║                                                              ║",
+    "║                                                              ║",
+    "║──────────────────────────────────────────────────────────────║",
+    "║                                                              ║",
+    "╚══════════════════════════════════════════════════════════════╝"
+  ],
+  "style_map": [
+    "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
+    "a                                                              a",
+    "a                                                              a",
+    "a                                                              a",
+    "a                                                              a",
+    "a                                                              a",
+    "a                                                              a",
+    "abbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbba",
+    "a                                                              a",
+    "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
+  ],
+  "canvas": {
+    "width": 64,
+    "height": 10
+  }
+}