feat(P17A-3,P17A-4): 实现采购申请接口附件与前端入口

client/src/pages/MobileApprovalsPage.tsx

@@ -26,6 +26,9 @@ function entityLabel(entityType: string | undefined) {
   if (entityType === "reimbursement") {
     return "报销";
   }
+  if (entityType === "purchase_request") {
+    return "采购";
+  }
   return entityType || "未知";
 }
 
@@ -107,7 +110,9 @@ export function MobileApprovalsPage() {
 
   const pendingTasks = tasksQuery.data?.items ?? [];
   const selectedTask = detailQuery.data;
-  const isLeaveTask = selectedTask?.workflowInstance?.entityType === "leave";
+  const canTransfer =
+    selectedTask?.workflowInstance?.entityType === "reimbursement" &&
+    selectedTask.allowedActions.includes("transfer");
 
   return (
     <div className="space-y-4">
@@ -176,6 +181,14 @@ export function MobileApprovalsPage() {
                   <div>请假天数：{selectedTask.leaveRequest.requestedDays}</div>
                 </>
               ) : null}
+              {selectedTask.purchaseRequest ? (
+                <>
+                  <div>采购单号：{selectedTask.purchaseRequest.requestNo ?? selectedTask.purchaseRequest.id}</div>
+                  <div>申请人：{selectedTask.purchaseRequest.applicant?.name ?? "-"}</div>
+                  <div>供应商：{selectedTask.purchaseRequest.supplier?.name ?? "-"}</div>
+                  <div>金额：{selectedTask.purchaseRequest.totalAmount ?? "-"}</div>
+                </>
+              ) : null}
             </div>
 
             <Textarea
@@ -215,7 +228,7 @@ export function MobileApprovalsPage() {
               </Button>
             </div>
 
-            {!isLeaveTask && selectedTask.allowedActions.includes("transfer") ? (
+            {canTransfer ? (
               <div className="space-y-2 rounded-lg border border-zinc-200 p-3 text-sm">
                 <p className="font-medium text-zinc-800">转审</p>
                 <select