LP6 完善请假采购体验与审批说明

client/src/api/purchaseRequests.ts

@@ -199,6 +199,16 @@ export type PurchaseRequestDetail = PurchaseRequestSummary & {
       assigneeRole: string | null;
     } | null;
   } | null;
+  approvalHistory: Array<{
+    id: string;
+    taskId: string | null;
+    actorId: string;
+    actorName: string | null;
+    actorEmployeeNo: string | null;
+    action: string;
+    comment: string | null;
+    createdAt: string | null;
+  }>;
   archiveOrder: PurchaseOrderArchive | null;
   permissions: {
     canEditDraft: boolean;