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.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

modules/website/500-error-tracker.sh

@@ -58,9 +58,12 @@ total_500s=0
 for log in "$DOMLOGS_DIR"/*; do
     [ -f "$log" ] || continue
     [[ "$log" =~ (bytes_log|offset|error_log|ftpxferlog|-ssl_log)$ ]] && continue
-    
+
     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)