feat(iap/apple): 实现苹果IAP非续期订阅功能

新增苹果IAP相关接口与逻辑，包括产品列表查询、交易绑定、状态查询和恢复购买功能。移除旧的IAP验证逻辑，重构订阅系统以支持苹果IAP交易记录存储和权益计算。

- 新增/pkg/iap/apple包处理JWS解析和产品映射
- 实现GET /products、POST /attach、POST /restore和GET /status接口
- 新增apple_iap_transactions表存储交易记录
- 更新文档说明配置方式和接口规范
- 移除旧的AppleIAP验证和通知处理逻辑

internal/logic/public/portal/purchaseCheckoutLogic.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"math"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/perfect-panel/server/internal/model/log"
@@ -224,8 +225,22 @@ func (l *PurchaseCheckoutLogic) stripePayment(config string, info *order.Order,
 		WebhookSecret: stripeConfig.WebhookSecret,
 	})
 
-	// Convert order amount to CNY using current exchange rate
-	amount, err := l.queryExchangeRate("CNY", info.Amount)
+	currency := "USD"
+	sysCurrency, _ := l.svcCtx.SystemModel.GetCurrencyConfig(l.ctx)
+	if sysCurrency != nil {
+		configs := struct {
+			CurrencyUnit   string
+			CurrencySymbol string
+			AccessKey      string
+		}{}
+		tool.SystemConfigSliceReflectToStruct(sysCurrency, &configs)
+		if configs.CurrencyUnit != "" {
+			currency = configs.CurrencyUnit
+		}
+	}
+
+	// Convert order amount to configured currency using current exchange rate
+	amount, err := l.queryExchangeRate(strings.ToUpper(currency), info.Amount)
 	if err != nil {
 		l.Errorw("[PurchaseCheckout] queryExchangeRate error", logger.Field("error", err.Error()))
 		return nil, errors.Wrapf(xerr.NewErrCode(xerr.ERROR), "queryExchangeRate error: %s", err.Error())
@@ -235,6 +250,7 @@ func (l *PurchaseCheckoutLogic) stripePayment(config string, info *order.Order,
 		logger.Field("src_cents", info.Amount),
 		logger.Field("decimal", amount),
 		logger.Field("cents", convertAmount),
+		logger.Field("currency", currency),
 	)
 
 	// Create Stripe payment sheet for client-side processing
@@ -247,7 +263,7 @@ func (l *PurchaseCheckoutLogic) stripePayment(config string, info *order.Order,
 		OrderNo:   info.OrderNo,
 		Subscribe: strconv.FormatInt(info.SubscribeId, 10),
 		Amount:    convertAmount,
-		Currency:  "cny",
+		Currency:  strings.ToLower(currency),
 		Payment:   paymentMethod,
 	}
 	usr := &stripe.User{Email: identifier}