feat: profit sharing

internal/service/category_service.go

@@ -91,6 +91,9 @@ func (s *CategoryServiceImpl) ListCategories(ctx context.Context, req *contract.
 	if req.BusinessType != "" {
 		filters["business_type"] = req.BusinessType
 	}
+	if req.ParentID != nil {
+		filters["parent_id"] = *req.ParentID
+	}
 	if req.Search != "" {
 		filters["search"] = req.Search
 	}