修复：内测问题修改：免费课程及课程详情代码优化、积分支付默认值、书籍价格显示

components/order/Confirm.vue

@@ -290,7 +290,11 @@ const handlePointsInput = (value: any) => {
   }
   
   // 重新计算实付款
-  calculateFinalPrice()
+  const result = Math.max(
+    0,
+    totalAmount.value - pointsDiscounted.value - promotionDiscounted.value - vipDiscounted.value
+  )
+  finalAmount.value = result
 }
 
 /**
@@ -314,9 +318,11 @@ const calculateFinalPrice = () => {
     props?.userInfo?.jf || 0,
     Math.floor(orderAmountAfterDiscount - couponAmount)
   )
+
+  pointsDiscounted.value = pointsUsableMax.value
   
   // 限制当前积分不超过最大值
-  if (pointsDiscounted.value > pointsUsableMax.value) {
+  if (pointsDiscounted.value >= pointsUsableMax.value) {
     pointsDiscounted.value = pointsUsableMax.value
   }