Replace echo -e with printf for portable ANSI banners

dash (Debian's /bin/sh) doesn't support echo's -e flag: it prints "-e"
literally as text before processing the rest of the string's backslash
escapes. Every script's colored banner was affected. printf's escape
handling is POSIX-mandated and behaves identically under dash and bash,
so swap all 90 echo -e calls for printf, appending the trailing \n that
echo used to add implicitly.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

bin/user.sh

@@ -1,13 +1,13 @@
 #!/bin/sh
 
-echo -e '\033[35m
+printf '\033[35m
    __  _______ __________
   / / / / ___// ____/ __ \
  / / / /\__ \/ __/ / /_/ /
 / /_/ /___/ / /___/ _, _/
 \____//____/_____/_/ |_|
-\033[0m'
-echo -e "\033[35;1mCreate new user (you will be asked a user name and a password) \033[0m"
+\033[0m\n'
+printf "\033[35;1mCreate new user (you will be asked a user name and a password) \033[0m\n"
 
 if [ "$(id -u)" -ne 0 ]; then
   echo "Please run as root"
@@ -43,4 +43,4 @@ groupadd admin
 usermod -a -G admin "$user"
 # allow admin group to su
 dpkg-statoverride --update --add root admin 4750 /bin/su
-echo -e "\033[92;1muser $user configured\033[Om"
+printf "\033[92;1muser $user configured\033[Om\n"