Filter out cPanel system logs from 500 error tracker

FILTERED LOG FILES:
- proxy (Apache reverse proxy logs)
- localhost (local connections)
- default (default vhost)
- cpanel, webmail, whm (cPanel services)
- cpcalendars, cpcontacts, webdisk (cPanel apps)

These are cPanel system services, not actual customer domains.
They were showing as 'unknown' user and cluttering results.

Now only tracks actual customer domain 500 errors.

modules/website/500-error-tracker.sh

@@ -62,6 +62,9 @@ for log in "$DOMLOGS_DIR"/*; do
     domain="${log##*/}"
     domain="${domain%%-*}"
 
+    # Skip non-domain system logs (proxy, localhost, etc.)
+    [[ "$domain" =~ ^(proxy|localhost|default|cpanel|webmail|whm|cpcalendars|cpcontacts|webdisk)$ ]] && continue
+    
     # Find cPanel user for this domain
     user=$(grep -l "DNS.*$domain" /var/cpanel/users/* 2>/dev/null | head -1 | xargs basename 2>/dev/null)
     [ -z "$user" ] && user="unknown"