fix: IAP 支付流程优化与关键 bug 修复

- getStatusLogic 类型断言修复（*user.User）
- restoreLogic 事务拆分为单条处理 + appAccountToken 解析
- attachTransactionLogic 提取 ParseProductIdDuration 共享函数
- 新增 config_helper.go 统一 Apple API 配置加载
- reconcileLogic 补充 BundleID 配置读取
- activateOrderLogic 邀请赠送天数逻辑完善

Co-Authored-By: claude-flow <ruv@ruv.net>

internal/logic/public/iap/apple/config_helper.go

@@ -0,0 +1,57 @@
+package apple
+
+import (
+	"context"
+	"encoding/json"
+	"strings"
+
+	"github.com/perfect-panel/server/internal/model/payment"
+	"github.com/perfect-panel/server/internal/svc"
+	iapapple "github.com/perfect-panel/server/pkg/iap/apple"
+)
+
+// LoadAppleServerAPIConfig loads the first enabled Apple IAP payment config
+// from the payment table and returns a ServerAPIConfig ready for API calls.
+func LoadAppleServerAPIConfig(ctx context.Context, svc *svc.ServiceContext) (*iapapple.ServerAPIConfig, error) {
+	pays, err := svc.PaymentModel.FindListByPlatform(ctx, "apple")
+	if err != nil {
+		return nil, err
+	}
+	for _, pay := range pays {
+		if pay.Enable == nil || !*pay.Enable || pay.Config == "" {
+			continue
+		}
+		var cfg payment.AppleIAPConfig
+		if e := cfg.Unmarshal([]byte(pay.Config)); e != nil {
+			continue
+		}
+		if cfg.KeyID == "" || cfg.IssuerID == "" || cfg.PrivateKey == "" {
+			continue
+		}
+		apiCfg := &iapapple.ServerAPIConfig{
+			KeyID:      cfg.KeyID,
+			IssuerID:   cfg.IssuerID,
+			PrivateKey: fixPEMKey(cfg.PrivateKey),
+			Sandbox:    cfg.Sandbox,
+		}
+		// Read BundleID from site custom data
+		if svc.Config.Site.CustomData != "" {
+			var customData struct {
+				IapBundleId string `json:"iapBundleId"`
+			}
+			_ = json.Unmarshal([]byte(svc.Config.Site.CustomData), &customData)
+			apiCfg.BundleID = customData.IapBundleId
+		}
+		return apiCfg, nil
+	}
+	return nil, nil
+}
+
+func fixPEMKey(key string) string {
+	if !strings.Contains(key, "\n") && strings.Contains(key, "BEGIN PRIVATE KEY") {
+		key = strings.ReplaceAll(key, " ", "\n")
+		key = strings.ReplaceAll(key, "-----BEGIN\nPRIVATE\nKEY-----", "-----BEGIN PRIVATE KEY-----")
+		key = strings.ReplaceAll(key, "-----END\nPRIVATE\nKEY-----", "-----END PRIVATE KEY-----")
+	}
+	return key
+}