fix(api): guard unmoved deals before pipeline merge delete

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

apps/api/src/pipelines/dto.ts

@@ -4,6 +4,7 @@ import {
   IsArray,
   IsBoolean,
   IsDateString,
+  IsIn,
   IsInt,
   IsNumber,
   IsObject,
@@ -362,5 +363,6 @@ export class MergePipelineDto {
 
   @IsOptional()
   @IsString()
+  @IsIn(['retarget_all'])
   leadFormMode?: 'retarget_all';
 }