feat(store): 门店详情核销记录走马灯

新增 GET /stores/:id/recent-redeems，C 端在门店详情区上方循环展示脱敏核销动态。

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

server/dukang-api/src/modules/redeem/redeem.service.ts

@@ -38,6 +38,15 @@ type TokenPayload = {
   allocations?: Array<{ couponId: string; amount: number }>;
 };
 
+/** C 端公示：用户138****5678 / 用户*** */
+function maskRedeemUserLabel(phone?: string | null): string {
+  const digits = String(phone || '').replace(/\D/g, '');
+  if (digits.length >= 7) {
+    return `用户${digits.slice(0, 3)}****${digits.slice(-4)}`;
+  }
+  return '用户***';
+}
+
 type PendingSnapshot = TokenPayload & {
   redeemType: 'DIRECT' | 'COUPON';
 };
@@ -1131,6 +1140,22 @@ export class RedeemService {
     };
   }
 
+  /** C 端门店详情走马灯：脱敏用户 + 时间 + 金额 */
+  async listPublicStoreRecentRedeems(storeId: bigint, limit = 20) {
+    const take = Math.min(Math.max(limit, 1), 50);
+    const list = await this.prisma.redeemRecord.findMany({
+      where: { storeId },
+      orderBy: { createdAt: 'desc' },
+      take,
+      include: { user: { select: { phone: true } } },
+    });
+    return list.map((r) => ({
+      userLabel: maskRedeemUserLabel(r.user?.phone),
+      amount: Number(r.amount),
+      createdAt: r.createdAt.toISOString(),
+    }));
+  }
+
   async submitRating(userId: bigint, body: { redeemRecordId: string; serviceScore: number; envScore: number }) {
     const record = await this.prisma.redeemRecord.findFirst({
       where: { id: BigInt(body.redeemRecordId), userId },