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

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

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

lib/domain-discovery.sh

@@ -38,7 +38,7 @@ list_all_domains() {
             else
                 # Fallback: scan /var/cpanel/users/
                 for user_file in /var/cpanel/users/*; do
-                    [ -f "$user_file" ] && grep "^DNS=" "$user_file" | cut -d'=' -f2
+                    [ -f "$user_file" ] && grep "^DNS=" -- "$user_file" | cut -d'=' -f2
                 done | sort -u
             fi
             ;;