feat: TUI updates — ASCII block logo, install demo script

- archipelago-menu.sh: replace box-drawing banner with ASCII block
  letter logo (ARCHIPELAGO in chunky block chars)
- scripts/install-tui-demo.sh: standalone TUI demo with all animations
  (boot scan, decrypt reveal, progress bars, bouncing BTC symbol,
  CRT transitions, celebration effects)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

image-recipe/archipelago-scripts/archipelago-menu.sh

@@ -62,13 +62,10 @@ show_banner() {
     get_width
     clear
     echo ""
-    btop
-    bbox ""
-    bbox "${W}a r c h i p e l a g o${N}"
-    bbox "${O}━━━━━━━━━━━━━━━━━━━━━${N}"
-    bbox "${D}bitcoin node os${N}"
-    bbox ""
-    bbot
+    echo -e "  ${O}▄▀█ █▀▄ █▀▀ █ █ █ █▀█ █▀▀ █   ▄▀█ █▀▀ █▀█${N}"
+    echo -e "  ${O}█▀█ █▀▄ █   █▀█ █ █▀▀ ██▀ █   █▀█ █ █ █ █${N}"
+    echo -e "  ${O}▀ ▀ ▀ ▀ ▀▀▀ ▀ ▀ ▀ ▀   ▀▀▀ ▀▀▀ ▀ ▀ ▀▀▀ ▀▀▀${N}"
+    echo -e "  ${D}bitcoin node os${N}"
     echo ""
 }