Standardize nginx setup in install scripts

Refactors many install scripts to use the shared `nginx_enable_site` helper instead of manual symlink/default-site/reload sequences, making webserver setup more consistent and less error-prone. It also replaces hardcoded PHP-FPM socket paths with `get_php_fpm_socket` (including templated substitutions where needed) across nginx and caddy configs to improve compatibility with varying PHP versions and socket locations.

install/privatebin-install.sh

@@ -37,6 +37,7 @@ systemctl restart php8.2-fpm
 msg_ok "Configured PHP"
 
 msg_info "Configuring Universal Nginx"
+PHP_SOCK=$(get_php_fpm_socket)
 cat <<EOF >/etc/nginx/sites-available/privatebin.conf
 server {
     listen 80 default_server;
@@ -60,7 +61,7 @@ server {
 
     location ~ \.php\$ {
         include snippets/fastcgi-php.conf;
-        fastcgi_pass unix:/var/run/php/php8.2-fpm.sock;
+        fastcgi_pass unix:${PHP_SOCK};
         fastcgi_param SCRIPT_FILENAME \$document_root\$fastcgi_script_name;
         include fastcgi_params;
     }
@@ -75,9 +76,7 @@ server {
     add_header X-XSS-Protection "1; mode=block";
 }
 EOF
-ln -s /etc/nginx/sites-available/privatebin.conf /etc/nginx/sites-enabled/
-rm -f /etc/nginx/sites-enabled/default
-systemctl reload nginx
+nginx_enable_site privatebin.conf
 msg_ok "Nginx Configured"
 
 motd_ssh