fix(cards): allow payload object in DTOs

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

backend/src/modules/cards/dto/cards.dto.ts

@@ -3,6 +3,7 @@ import {
   IsDateString,
   IsEnum,
   IsOptional,
+  IsObject,
   IsString,
   IsUUID,
   MaxLength,
@@ -51,6 +52,7 @@ export class CreerCarteDto {
 
   @ApiPropertyOptional()
   @IsOptional()
+  @IsObject()
   payload?: Record<string, any>;
 }
 
@@ -86,6 +88,7 @@ export class MajCarteDto {
 
   @ApiPropertyOptional()
   @IsOptional()
+  @IsObject()
   payload?: Record<string, any>;
 }