Make Arvan DNS updates opt-in and persist English user names.

Domain add/edit only upserts Arvan records when updateDns is true, and super-admin user PATCH now accepts firstNameEn and lastNameEn.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/business-admin/dto/update-domain.dto.ts

@@ -1,4 +1,4 @@
-import { IsOptional, IsString, Matches, MinLength } from 'class-validator';
+import { IsBoolean, IsOptional, IsString, Matches, MinLength } from 'class-validator';
 import { GIT_REPO_URL_RE } from '../../website-deploy/website-deploy.util';
 
 export class UpdateDomainDto {
@@ -6,6 +6,11 @@ export class UpdateDomainDto {
   @MinLength(1)
   host!: string;
 
+  /** When true, upsert Meshkee tenant records in Arvan DNS. */
+  @IsOptional()
+  @IsBoolean()
+  updateDns?: boolean;
+
   /** HTTPS or SSH git URL — when set, provisions storefront deploy on the websites VM. */
   @IsOptional()
   @IsString()