fix: setup wizard compatible sh/dash (read -s fallback)

Use stty -echo instead of read -s for password input,
compatible with dash/sh shells found on Ubuntu/Debian servers.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

scripts/setup-env.sh

@@ -62,7 +62,9 @@ ask_password() {
     local varname="$2"
 
     echo -ne "${YELLOW}${prompt}${NC}: "
-    read -rs answer
+    stty -echo 2>/dev/null || true
+    read -r answer
+    stty echo 2>/dev/null || true
     echo ""
     eval "$varname=\"\$answer\""
 }