Fix installer bugs: broken root checks, PHP version mismatches, dead paths

- Replace $EUID with $(id -u) for root checks across all bin/*.sh and
  install.sh: dash (Debian's /bin/sh) never sets $EUID, so the check was
  silently broken everywhere.
- lemp.sh: make apt-get upgrade non-interactive (--yes), align the Redis
  PHP module and php-fpm restart with $PHP_VERSION instead of a hardcoded
  8.1, and template the nginx PHP-FPM socket path via a PHP_FPM_SOCK
  placeholder substituted at install time.
- nginx-phpmyadmin.conf: fix docroot to match the actual phpMyAdmin
  symlink location created by lemp.sh.
- mysql-db.sh: inline the root check instead of sourcing the
  nonexistent bin/checkroot.sh.
- webhook.sh: fix chowm typo (chown).
- urbackup.sh: copy the systemd unit from assets/ instead of a relative
  path to a file that doesn't exist in the repo.
- _addUserSite.sh: fix invalid `$var=value` assignment and an empty
  if-block that was a POSIX sh syntax error.

Also carries over pending fixes to deploy-drupal.sh (drush now
invoked via vendor/bin/drush) and gitbarrerepos.sh (comment cleanup).

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

bin/lemp.sh

@@ -10,7 +10,7 @@ echo -e '\033[35m
 \033[0m'
 echo -e "\033[35;1mLEMP server (Nginx Mysql Php-fpm) \033[0m"
 
-if [ "$EUID" -ne 0 ]; then
+if [ "$(id -u)" -ne 0 ]; then
   echo "Please run as root"
   exit
 fi
@@ -42,7 +42,7 @@ sleep 3
 
 apt-get --yes install ca-certificates apt-transport-https software-properties-common curl lsb-release
 curl -sSL https://packages.sury.org/php/README.txt | bash -x
-apt-get update && apt-get upgrade
+apt-get update && apt-get --yes upgrade
 
 echo -e "\033[35;1mInstalling PHP \033[0m"
 sleep 3
@@ -103,6 +103,7 @@ sleep 3
 apt-get --yes install nginx
 mv /etc/nginx/sites-available/default /etc/nginx/sites-available/default.ori
 cp "$_assets"/default.nginxconf /etc/nginx/sites-available/default
+sed -i "s/PHP_FPM_SOCK/php${PHP_VERSION}-fpm.sock/g" /etc/nginx/sites-available/default
 
 systemctl enable nginx
 systemctl restart nginx
@@ -163,6 +164,7 @@ if [ "$installmysql" = "yes" ]; then
   apt-get --yes install phpmyadmin
   ln -s /usr/share/phpmyadmin /var/www/html/
   cp "$_assets"/nginx-phpmyadmin.conf /etc/nginx/sites-available/phpmyadmin.conf
+  sed -i "s/PHP_FPM_SOCK/php${PHP_VERSION}-fpm.sock/g" /etc/nginx/sites-available/phpmyadmin.conf
     
   echo -e "\033[92;1mphpMyAdmin installed\033[Om"
   echo -e "\033[92;1mYou can access it at yourip/phpmyadmin\033[Om"
@@ -192,7 +194,7 @@ echo -e '\033[35m
 \033[0m'
 echo -e "\033[35;1mInstalling Redis \033[0m"
 sleep 3
-apt-get --yes install redis-server php8.1-redis
+apt-get --yes install redis-server php${PHP_VERSION}-redis
 
 # TODO set maxmemory=2gb
 # TODO set maxmemory-policy=volatile-lru
@@ -206,7 +208,7 @@ apt-get --yes install redis-server php8.1-redis
 
 systemctl enable redis-server
 systemctl restart redis-server
-systemctl restart php8.1-fpm
+systemctl restart php${PHP_VERSION}-fpm
 echo -e "\033[92;1mRedis installed\033[Om"
 
 echo -e '\033[35m