feat(buyer): 更新电子卡券（E_COUPON）相关逻辑与展示

- 优化购物车与支付页面，确保电子卡券只能通过立即购买结算
- 增强商品详情页，添加限时折扣与第N件优惠展示
- 更新促销逻辑，支持拼团与积分购买选项
- 规范化商品类型与库存提示，提升用户体验

seller/src/views/lili-dialog/goods-dialog.vue

@@ -41,10 +41,19 @@
             </div>
             <div class="wap-content-desc">
               <div class="wap-content-desc-title">{{ item.goodsName }}</div>
+
               <div class="wap-sku">
                 {{ item.goodsUnit }}
                 <el-tag
-                  style="margin-left: 10px"
+                  v-if="item.goodsType"
+                  style="margin-left: 6px"
+                  size="small"
+                  :type="goodsTypeTagType(item.goodsType)"
+                >
+                  {{ goodsTypeLabel(item.goodsType) }}
+                </el-tag>
+                <el-tag
+                  style="margin-left: 6px"
                   :type="item.salesModel === 'RETAIL' ? 'info' : 'primary'"
                 >
                   {{ item.salesModel === "RETAIL" ? "零售型" : "批发型" }}
@@ -52,6 +61,9 @@
               </div>
               <div class="wap-content-desc-bottom">
                 <div>￥{{ $filters.unitPrice(item.price) }}</div>
+                <div v-if="item.goodsType === 'E_COUPON'" class="pool-stock-hint">
+                  库存 {{ item.quantity != null ? item.quantity : "—" }}（卡池）
+                </div>
               </div>
             </div>
           </div>
@@ -73,6 +85,7 @@
 </template>
 <script>
 import * as API_Goods from "@/api/goods";
+import { goodsTypeLabel, goodsTypeTagType } from "@/constants/goodsType";
 export default {
   props: {
     selectedWay: {
@@ -127,6 +140,8 @@ export default {
     this.init();
   },
   methods: {
+    goodsTypeLabel,
+    goodsTypeTagType,
     onSearchGoods() {
       this.goodsData = [];
       this.goodsParams.pageNumber = 1;
@@ -265,6 +280,11 @@ export default {
   margin-top: 12px;
   justify-content: flex-end;
 }
+.pool-stock-hint {
+  font-size: 12px;
+  color: #999;
+  margin-top: 4px;
+}
 </style>
 <style lang="scss">
 .goods-dialog-cascader-popper {