feat(pipelines): merge stage-map util and shared DTOs

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

packages/shared/src/index.ts

@@ -996,6 +996,50 @@ export interface ReorderPipelineStagesRequest {
   stageIds: string[];
 }
 
+export type PipelineMergeLeadFormMode = 'retarget_all';
+
+export interface PipelineMergePreviewStageDto {
+  id: string;
+  name: string;
+  isWon: boolean;
+  isLost: boolean;
+  dealCount: number;
+}
+
+export interface PipelineMergePreviewTargetDto {
+  id: string;
+  name: string;
+  isDefault: boolean;
+  stages: Array<{
+    id: string;
+    name: string;
+    isWon: boolean;
+    isLost: boolean;
+  }>;
+}
+
+export interface PipelineMergePreviewDto {
+  source: { id: string; name: string; isDefault: boolean };
+  stages: PipelineMergePreviewStageDto[];
+  dealCount: number;
+  leadForms: Array<{ id: string; name: string; isActive: boolean }>;
+  targets: PipelineMergePreviewTargetDto[];
+}
+
+export interface MergePipelineRequest {
+  targetPipelineId: string;
+  stageMap: Record<string, string>;
+  leadFormMode?: PipelineMergeLeadFormMode;
+}
+
+export interface MergePipelineResultDto {
+  ok: true;
+  targetPipelineId: string;
+  movedDeals: number;
+  retargetedLeadForms: number;
+  deletedPipelineId: string;
+}
+
 export interface CreateDealRequest {
   title: string;
   pipelineId?: string;