feat(android): install Android CLI only on demand (setup.sh item 8)

ai-setup.sh no longer installs Google Android CLI or runs android init,
so menu items 1 and 7 (setup / update) leave it alone. The install
block moved verbatim into scripts/android-cli-setup.sh, which menu item
8 now runs instead of the whole ai-setup.sh.

The final summary of ai-setup.sh points to item 8, README describes the
opt-in install, tests check the new script and that ai-setup.sh does
not install Android CLI any more.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

setup.sh

@@ -107,7 +107,7 @@ else
   echo -e "     ${GRY}git pull + перегенерация всех скриптов в ~/bin (или ~/.local/bin).${CLR}"
   echo ""
   echo -e "  ${BLD}8) Android CLI${CLR}"
-  echo -e "     ${GRY}Установить Google Android CLI для Android-разработки.${CLR}"
+  echo -e "     ${GRY}Установить Google Android CLI для Android-разработки (пункт 1 его не ставит).${CLR}"
   echo ""
   echo -n "Выбери [1-8] или Enter для выхода: "
   read -r choice
@@ -279,7 +279,7 @@ case "$choice" in
     do_update
     ;;
   8)
-    bash scripts/ai-setup.sh
+    bash scripts/android-cli-setup.sh
     ;;
   "")
     exit 0