Fix ESCAPE issues in multiple library files

- lib/domain-discovery.sh: Added -- to grep command (1 fix)
- lib/reference-db.sh: Added -- to grep command (1 fix)
- lib/user-manager.sh: Added -- to grep command (1 fix)
- lib/email-functions.sh: Added -- to awk and grep commands (2 fixes)
- lib/php-config-manager.sh: Added -- to grep commands (3 fixes)
- lib/php-detector.sh: Added -- to grep command (1 fix)
Total: 9 ESCAPE fixes

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

lib/user-manager.sh

@@ -131,7 +131,7 @@ get_cpanel_user_info() {
     local home_dir="/home/${username}"
 
     # Get addon/parked domains
-    local all_domains=$(grep "^DNS" "$user_file" | cut -d= -f2 | tr '\n' ' ')
+    local all_domains=$(grep "^DNS" -- "$user_file" | cut -d= -f2 | tr '\n' ' ')
 
     # Get disk usage
     local disk_used=$(du -sh "$home_dir" 2>/dev/null | awk '{print $1}')