Add store-item Excel export/import for bulk price and stock updates.

Dashboard can download grouped product variants and re-upload to update price and stock. Also expose Content-Disposition for downloads and keep related product/customer API docs in sync.

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

src/customers/dto/update-customer.dto.ts

@@ -1,4 +1,11 @@
-import { IsBoolean, IsOptional, IsString, MinLength } from 'class-validator';
+import {
+  IsBoolean,
+  IsOptional,
+  IsString,
+  MaxLength,
+  MinLength,
+  ValidateIf,
+} from 'class-validator';
 
 export class UpdateCustomerDto {
   @IsOptional()
@@ -8,13 +15,29 @@ export class UpdateCustomerDto {
   @IsOptional()
   @IsString()
   @MinLength(1)
+  @MaxLength(100)
   firstName?: string;
 
   @IsOptional()
   @IsString()
   @MinLength(1)
+  @MaxLength(100)
   lastName?: string;
 
+  @IsOptional()
+  @IsString()
+  @ValidateIf((_, value) => typeof value === 'string' && value.trim().length > 0)
+  @MinLength(2)
+  @MaxLength(100)
+  firstNameEn?: string;
+
+  @IsOptional()
+  @IsString()
+  @ValidateIf((_, value) => typeof value === 'string' && value.trim().length > 0)
+  @MinLength(2)
+  @MaxLength(100)
+  lastNameEn?: string;
+
   @IsOptional()
   @IsString()
   email?: string;