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/php-detector.sh

@@ -68,7 +68,7 @@ detect_php_version_for_domain() {
             # Check userdata for PHP version
             local userdata_file="${SYS_CPANEL_USERDATA_DIR:-/var/cpanel/userdata}/$username/$domain"
             if [ -f "$userdata_file" ]; then
-                local php_ver=$(grep "phpversion:" "$userdata_file" | awk '{print $2}' | tr -d "'\"")
+                local php_ver=$(grep "phpversion:" -- "$userdata_file" | awk '{print $2}' | tr -d "'\"")
                 echo "$php_ver"
                 return 0
             fi