consolidate migrations

src/modules/invoice/dto/create-invoice.dto.ts

@@ -33,6 +33,12 @@ export class CreateInvoiceItemDto {
   @ApiPropertyOptional({ example: 0 })
   discount?: number;
 
+  @IsOptional()
+  @IsInt()
+  @Min(0)
+  @ApiPropertyOptional({ example: 10, description: 'Discount percentage (0–100)' })
+  discountPercent?: number;
+
   @IsOptional()
   @IsString()
   @ApiPropertyOptional()