fix: harden upstream and downstream receipt delivery

src/apps/admin/AdminDownstreamDeliveriesPage.tsx

@@ -66,6 +66,35 @@ function DeliveryDetailModal({ record, onClose }: { record: DownstreamDeliveryRe
           <div><span>连接 ID</span><strong>{record.connectionId ?? '-'}</strong></div>
           <div className="detail-grid__wide"><span>最后错误</span><strong>{record.lastError ?? '-'}</strong></div>
         </div>
+        <section className="report-history">
+          <h3>逐次投递记录</h3>
+          <div className="downstream-attempt-table" role="table" aria-label="逐次投递记录">
+            <div className="downstream-attempt-table__header" role="row">
+              <span>次数 / 状态</span><span>发送 / ACK 时间</span><span>连接 / Sequence / Msg_Id</span><span>结果</span>
+            </div>
+            {(record.attempts ?? []).map((attempt) => (
+              <div key={attempt.id} role="row">
+                <strong>第 {attempt.attemptNo} 次<br />{attempt.status}</strong>
+                <span>
+                  {attempt.sentAt ? formatDateTime(attempt.sentAt) : '-'}
+                  <br />
+                  ACK：{attempt.acknowledgedAt ? formatDateTime(attempt.acknowledgedAt) : '-'}
+                </span>
+                <span>
+                  {attempt.connectionId ?? '-'}
+                  <br />
+                  Seq：{attempt.sequenceId ?? '-'} / Msg：{attempt.messageId ?? '-'}
+                </span>
+                <span>
+                  ACK Result：{attempt.ackResult ?? '-'}
+                  <br />
+                  {attempt.errorMessage ?? attempt.failureType ?? '-'}
+                </span>
+              </div>
+            ))}
+            {(record.attempts ?? []).length === 0 ? <p>暂无逐次投递记录</p> : null}
+          </div>
+        </section>
         <section className="report-history">
           <h3>Payload</h3>
           <pre style={{ whiteSpace: 'pre-wrap', wordBreak: 'break-word', margin: 0 }}>{payloadText}</pre>