feat: 增加礼品卡选择功能及相关逻辑

- 在 api/trade.js 中新增 selectGiftCard 函数以支持礼品卡选择
- 更新多个组件以集成礼品卡功能，包括购物车和订单页面
- 优化商品页面和订单详情展示，支持礼品卡抵扣信息
- 调整相关逻辑以确保礼品卡与其他促销活动的兼容性

pages/product/product/promotion/-promotion-assemble-promotions.vue

@@ -5,6 +5,7 @@
         class="showBox"
         v-if="
           promotion.__key == 'SECKILL' ||
+          promotion.__key == 'FLASH_DISCOUNT' ||
           promotion.__key == 'GROUPBUY' ||
           promotion.__key == 'PINTUAN'
         "
@@ -36,6 +37,29 @@
                   </view>
                 </view>
 
+                <!-- 限时直降 -->
+                <view class="u-group-flex-left" v-if="promotion.__key == 'FLASH_DISCOUNT'">
+                  <span
+                    class="u-group-flex-left-span"
+                    v-if="detail.promotionPrice != undefined"
+                  >
+                    ￥
+                    <span class="flex-price">
+                      {{ goodsFormatPrice(detail.promotionPrice)[0] }}.{{
+                        goodsFormatPrice(detail.promotionPrice)[1]
+                      }}</span
+                    >
+                  </span>
+                  <view class="u-group-flex" v-if="detail.price != undefined">
+                    <span class="old-price"
+                      >￥{{ goodsFormatPrice(detail.price)[0] }}.{{
+                        goodsFormatPrice(detail.price)[1]
+                      }}</span
+                    >
+                    <view class="promotion">限时直降</view>
+                  </view>
+                </view>
+
                 <!-- 团购 -->
                 <view class="u-group-flex-left" v-if="promotion.__key == 'GROUPBUY'">
                   <span class="u-group-flex-left-span">

pages/product/product/promotion/-promotion-details.vue

@@ -40,6 +40,26 @@
         </view>
       </view>
 
+      <view v-if="getPromType(prom) == 'FLASH_DISCOUNT'">
+        <view class="res_prom_item">
+          <view class="deg_tag">限时直降</view>
+          <text class="pro-text">{{ props.res[prom].promotionName || props.res[prom].title || '限时直降活动' }}</text>
+        </view>
+      </view>
+
+      <view v-if="getPromType(prom) == 'NTH_ITEM_DISCOUNT'">
+        <view class="res_prom_item">
+          <view class="deg_tag">第N件优惠</view>
+          <text class="pro-text">
+            第{{ props.res[prom].nthNum || 'N' }}件
+            <text v-if="props.res[prom].discountType === 'FREE'">免费</text>
+            <text v-else-if="props.res[prom].discountType === 'HALF'">半价</text>
+            <text v-else-if="props.res[prom].discountValue">享{{ props.res[prom].discountValue }}折</text>
+            <text v-else>优惠</text>
+          </text>
+        </view>
+      </view>
+
       <view v-if="getPromType(prom) == 'POINTS_GOODS'">
         <view class="res_prom_item">
           <view class="deg_tag">积分活动</view>

pages/product/product/promotion/-promotion.vue

@@ -2,6 +2,18 @@
 	<view>
 		<view v-for="(promotionItem, promotionIndex) in promotion" :key="promotionIndex" class="promotion_row" @click="shutMask(1)">
 			<view v-if="res != null" v-for="(item, index) in Object.keys(res)" :key="index">
+				<div class="promotion_col" v-if="item.split('-')[0] == promotionItem.value && item.split('-')[0] == 'FLASH_DISCOUNT'">
+					<div class="flex">
+						<view class="deg_tag">{{ promotionItem.title }}</view>
+						<div class="text proText">{{ res[item].promotionName || res[item].title || '限时直降' }}</div>
+					</div>
+				</div>
+				<div class="promotion_col" v-if="item.split('-')[0] == promotionItem.value && item.split('-')[0] == 'NTH_ITEM_DISCOUNT'">
+					<div class="flex">
+						<view class="deg_tag">{{ promotionItem.title }}</view>
+						<div class="text proText">{{ res[item].promotionName || res[item].title || '第N件优惠' }}</div>
+					</div>
+				</div>
 				<div class="promotion_col" v-if="item.split('-')[0] == promotionItem.value && item.split('-')[0] == 'FULL_DISCOUNT'">
 					<!-- 满减，折扣 -->
 					<div class="flex">

pages/product/product/promotion/promotion_type.js

@@ -8,21 +8,17 @@ const promotion = [
     value: "KANJIA",
   },
   {
-    title: "单品立减",
-    value: "MINUS",
+    title: "限时直降",
+    value: "FLASH_DISCOUNT",
+  },
+  {
+    title: "第N件优惠",
+    value: "NTH_ITEM_DISCOUNT",
   },
   {
     title: "团购",
     value: "GROUPBUY",
   },
-  {
-    title: "积分换购",
-    value: "EXCHANGE",
-  },
-  {
-    title: "第二件半价",
-    value: "HALF_PRICE",
-  },
   {
     title: "满减优惠",
     value: "FULL_DISCOUNT",
@@ -50,4 +46,4 @@ export function formatType(val){
             }
         })
     }
-}
+}