feat(支付): 新增Apple IAP支付支持

实现Apple应用内购支付功能，包括：
1. 新增AppleIAP和ApplePay支付平台枚举
2. 添加IAP验证接口/v1/public/iap/verify处理初购验证
3. 实现Apple服务器通知处理逻辑/v1/iap/notifications
4. 新增JWS验签和JWKS公钥缓存功能
5. 复用现有订单系统处理IAP支付订单

相关文档已更新，包含接入方案和实现细节

internal/logic/public/portal/purchaseCheckoutLogic.go

@@ -86,7 +86,18 @@ func (l *PurchaseCheckoutLogic) PurchaseCheckout(req *types.CheckoutOrderRequest
 
 	case paymentPlatform.Stripe:
 		// Process Stripe payment - creates payment sheet for client-side processing
-		stripePayment, err := l.stripePayment(paymentConfig.Config, orderInfo, "")
+		stripePayment, err := l.stripePayment(paymentConfig.Config, orderInfo, "", "")
+		if err != nil {
+			return nil, errors.Wrapf(xerr.NewErrCode(xerr.ERROR), "stripePayment error: %v", err.Error())
+		}
+		resp = &types.CheckoutOrderResponse{
+			Type:   "stripe", // Client should use Stripe SDK
+			Stripe: stripePayment,
+		}
+
+	case paymentPlatform.ApplePay:
+		// Process Apple Pay payment - uses Stripe with 'card' method
+		stripePayment, err := l.stripePayment(paymentConfig.Config, orderInfo, "", "card")
 		if err != nil {
 			return nil, errors.Wrapf(xerr.NewErrCode(xerr.ERROR), "stripePayment error: %v", err.Error())
 		}
@@ -208,7 +219,7 @@ func (l *PurchaseCheckoutLogic) alipayF2fPayment(pay *payment.Payment, info *ord
 
 // stripePayment processes Stripe payment by creating a payment sheet
 // It supports various payment methods including WeChat Pay and Alipay through Stripe
-func (l *PurchaseCheckoutLogic) stripePayment(config string, info *order.Order, identifier string) (*types.StripePayment, error) {
+func (l *PurchaseCheckoutLogic) stripePayment(config string, info *order.Order, identifier string, forceMethod string) (*types.StripePayment, error) {
 	// Parse Stripe configuration from payment settings
 	stripeConfig := &payment.StripeConfig{}
 
@@ -217,6 +228,10 @@ func (l *PurchaseCheckoutLogic) stripePayment(config string, info *order.Order,
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.ERROR), "Unmarshal error: %s", err.Error())
 	}
 
+	if forceMethod != "" {
+		stripeConfig.Payment = forceMethod
+	}
+
 	// Initialize Stripe client with API credentials
 	client := stripe.NewClient(stripe.Config{
 		SecretKey:     stripeConfig.SecretKey,