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/trident-shield.json

@@ -0,0 +1,63 @@
+{
+  "name": "trident-shield",
+  "title": {
+    "uk": "Малий герб України (тризуб на щиті)",
+    "en": "Lesser coat of arms of Ukraine (tryzub on a shield)"
+  },
+  "styles": {
+    "a": {
+      "fg": "blue",
+      "bg": null,
+      "bold": false
+    },
+    "b": {
+      "fg": "bright_yellow",
+      "bg": null,
+      "bold": false
+    },
+    "c": {
+      "fg": "blue",
+      "bg": "bright_yellow",
+      "bold": false
+    },
+    "d": {
+      "fg": "bright_yellow",
+      "bg": "blue",
+      "bold": false
+    }
+  },
+  "lines": [
+    "██████████████████████",
+    "██████████████████████",
+    "████▀████████████▀████",
+    "████▀█▀████████▀█▀████",
+    "██████████████████████",
+    "███████▀██████▀███████",
+    "██████████████████████",
+    "█████▀█▀█▀██▀█▀█▀█████",
+    "██████▀█▀████▀█▀██████",
+    "██████▀███▀▀███▀██████",
+    "████▀▀▀██▀██▀██▀▀▀████",
+    "███▀▀▀▀▀█▀██▀█▀▀▀▀▀███",
+    " ▀██████▀████▀██████▀",
+    "   ▀▀▀████▀▀████▀▀▀",
+    "        ▀▀██▀▀"
+  ],
+  "style_map": [
+    "aaaaaaaaaaaaaaaaaaaaaa",
+    "aaaaaaaaaabbaaaaaaaaaa",
+    "aaabcaaaaabbaaaaacbaaa",
+    "aaabdbcaaabbaaacbdbaaa",
+    "aaabaabaaabbaaabaabaaa",
+    "aaabaabcaabbaacbaabaaa",
+    "aaabaabbaabbaabbaabaaa",
+    "aaabacbdacbbcadbcabaaa",
+    "aaabbbcacbaabcacbbbaaa",
+    "aaabaadbbbccbbbdaabaaa",
+    "aaabcccbbcbbcbbcccbaaa",
+    "aaadddddbdbbdbdddddaaa",
+    " aaaaaaadbbbbdaaaaaaa",
+    "   aaaaaaaddaaaaaaa",
+    "        aaaaaa"
+  ]
+}