fix: skip domain authorization check for internal system tenant

dap-gateway/src/main/java/io/shinhanlife/dap/mcg/service/ToolPlanner.java

@@ -81,7 +81,7 @@ public class ToolPlanner {
         }
 
         // 2-1. [신규] 도메인 그룹핑 기반 권한 검증
-        if (tenantId != null && toolMetadata.getCategoryKey() != null) {
+        if (tenantId != null && !tenantId.equalsIgnoreCase("system") && toolMetadata.getCategoryKey() != null) {
             String normalizedTenantId = tenantId.toLowerCase();
             List<String> allowedDomains = securityProperties.getTenantDomains().get(normalizedTenantId);