继续完善购物逻辑闭环，consumer模块完成度75%

pages/mall/consumer/order-detail.uvue

@@ -91,6 +91,7 @@
       <button v-if="order.status === 2" class="remind-btn" @click="remindDelivery">提醒发货</button>
       <button v-if="order.status === 3" class="confirm-btn" @click="confirmReceive">确认收货</button>
       <button v-if="order.status === 4" class="review-btn" @click="goToReview">评价商品</button>
+      <button v-if="order.status >= 2 && order.status <= 4" class="refund-btn" @click="applyRefund">申请售后</button>
       <button v-if="order.status <= 2" class="cancel-btn" @click="cancelOrder">取消订单</button>
       <button class="service-btn" @click="contactService">联系客服</button>
     </view>
@@ -310,6 +311,12 @@ export default {
       })
     },
     
+    applyRefund() {
+      uni.navigateTo({
+        url: `/pages/mall/consumer/apply-refund?orderId=${this.order.id}`
+      })
+    },
+
     cancelOrder() {
       uni.showModal({
         title: '取消订单',
@@ -578,6 +585,12 @@ export default {
   color: #fff;
 }
 
+.refund-btn {
+  background-color: #ffffff;
+  color: #666;
+  border: 1px solid #ccc;
+}
+
 .cancel-btn {
   background-color: #f5f5f5;
   color: #666;