feat(支付): 添加Apple应用内支付支持

- 在CheckoutOrderResponse结构中添加product_ids字段用于存储Apple IAP产品ID
- 新增AppleIAP支付平台常量及映射
- 实现Apple IAP支付处理逻辑，生成对应的产品ID

internal/logic/public/portal/purchaseCheckoutLogic.go

@@ -3,6 +3,7 @@ package portal
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"math"
 	"strconv"
 	"strings"
@@ -74,6 +75,13 @@ func (l *PurchaseCheckoutLogic) PurchaseCheckout(req *types.CheckoutOrderRequest
 	}
 	// Route to appropriate payment handler based on payment platform
 	switch paymentPlatform.ParsePlatform(orderInfo.Method) {
+	case paymentPlatform.AppleIAP:
+		productId := fmt.Sprintf("merchant.hifastvpn.day%d", orderInfo.Quantity)
+		resp = &types.CheckoutOrderResponse{
+			Type:       "apple_iap",
+			ProductIds: []string{productId},
+		}
+		return resp, nil
 	case paymentPlatform.EPay:
 		// Process EPay payment - generates payment URL for redirect
 		url, err := l.epayPayment(paymentConfig, orderInfo, req.ReturnUrl)

internal/types/types.go

@@ -241,6 +241,7 @@ type CheckoutOrderResponse struct {
 	Type        string         `json:"type"`
 	CheckoutUrl string         `json:"checkout_url,omitempty"`
 	Stripe      *StripePayment `json:"stripe,omitempty"`
+	ProductIds  []string       `json:"product_ids,omitempty"`
 }
 
 type CloseOrderRequest struct {