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/knockd.sh

@@ -2,14 +2,14 @@
 
 # TODO check if root
 
-echo -e '\033[35m
+printf '\033[35m
     __                    __       __
    / /______  ____  _____/ /______/ /
   / //_/ __ \/ __ \/ ___/ //_/ __  /
  / ,< / / / / /_/ / /__/ ,< / /_/ /
 /_/|_/_/ /_/\____/\___/_/|_|\__,_/
-\033[0m'
-echo -e "\033[35;1mInstalling knockd to control ssh port opening\033[0m"
+\033[0m\n'
+printf "\033[35;1mInstalling knockd to control ssh port opening\033[0m\n"
 
 if [ "$(id -u)" -ne 0 ]; then
   echo "Please run as root"
@@ -50,7 +50,7 @@ Alias=knockd.service" >> /lib/systemd/system/knockd.service
 systemctl enable knockd
 systemctl start knockd
 
-echo -e "\033[92;1mknockd installed and configured\033[Om"
-echo -e "\033[92;1mplease note this sequence for future ssh knocking\033[Om"
+printf "\033[92;1mknockd installed and configured\033[Om\n"
+printf "\033[92;1mplease note this sequence for future ssh knocking\033[Om\n"
 echo "$sq"
 sleep 3