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/fail2ban.sh

@@ -2,14 +2,14 @@
 
 # TODO check if root
 
-echo -e '\033[35m
+printf '\033[35m
     ______      _ _____   __
    / ____/___ _(_) /__ \ / /_  ____ _____
   / /_  / __ `/ / /__/ // __ \/ __ `/ __ \
  / __/ / /_/ / / // __// /_/ / /_/ / / / /
 /_/    \__,_/_/_//____/_.___/\__,_/_/ /_/
-\033[0m'
-echo -e "\033[35;1mInstalling fall2ban \033[0m"
+\033[0m\n'
+printf "\033[35;1mInstalling fall2ban \033[0m\n"
 
 if [ "$(id -u)" -ne 0 ]; then
   echo "Please run as root"
@@ -23,4 +23,4 @@ cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local
 touch /var/log/auth.log
 systemctl enable fail2ban
 systemctl restart fail2ban
-echo -e "\033[92;1mfail2ban installed and configured\033[Om"
+printf "\033[92;1mfail2ban installed and configured\033[Om\n"