fix: 退货页面调用后端退款接口恢复库存

src/pages/order/return.vue

@@ -219,15 +219,21 @@ export default {
         this.returnQty++
       }
     },
-    confirmReturn() {
+    async confirmReturn() {
       if (this.returnQty <= 0 || this.returnQty > this.currentItem.returnableQty) {
         uni.showToast({ title: '退货数量无效', icon: 'none' })
         return
       }
+      
+      try {
+        await orderApi.refundOrder(this.currentItem.orderId)
         uni.showToast({ title: '退货成功', icon: 'success' })
-      // TODO: 调用后端创建退货订单
         this.closePopup()
         this.loadReturnableGoods()
+      } catch (e) {
+        console.error(e)
+        uni.showToast({ title: e.message || '退货失败', icon: 'none' })
+      }
     }
   }
 }