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/art/das-logo-small.json

@@ -0,0 +1,74 @@
+{
+  "name": "das-logo-small",
+  "title": {
+    "uk": "Логотип Das OS, малий",
+    "en": "Das OS logo, small"
+  },
+  "styles": {
+    "a": {
+      "fg": "bright_yellow",
+      "bg": null,
+      "bold": false
+    },
+    "b": {
+      "fg": "bright_blue",
+      "bg": null,
+      "bold": false
+    },
+    "c": {
+      "fg": "bright_yellow",
+      "bg": "blue",
+      "bold": false
+    },
+    "d": {
+      "fg": "yellow",
+      "bg": "bright_blue",
+      "bold": false
+    },
+    "e": {
+      "fg": "bright_yellow",
+      "bg": "yellow",
+      "bold": false
+    },
+    "f": {
+      "fg": "bright_yellow",
+      "bg": "bright_blue",
+      "bold": false
+    },
+    "g": {
+      "fg": "bright_blue",
+      "bg": "bright_yellow",
+      "bold": false
+    },
+    "h": {
+      "fg": "blue",
+      "bg": "bright_yellow",
+      "bold": false
+    },
+    "i": {
+      "fg": "bright_blue",
+      "bg": "yellow",
+      "bold": false
+    }
+  },
+  "lines": [
+    "",
+    "   ▄▄  ██  ▄▄",
+    "   ▀█▀█▀▀█▀█▀",
+    "  ▄▄▀▀▀▀▀▀▀▀▄▄",
+    "  ▀▀▀▀▀▀▀▀▀▀▀▀",
+    "    █▀█▀▀█▀█",
+    "   ▀▀  ██  ▀▀",
+    ""
+  ],
+  "style_map": [
+    "",
+    "   aa  bb  aa",
+    "   aacaddacaa",
+    "  bbeffggffebb",
+    "  bbdggffggdbb",
+    "    ahaiiaha",
+    "   aa  bb  aa",
+    ""
+  ]
+}