修复 UR#55 代码审查问题：事务隔离、错误包装、重复辅助函数

- resolvePackageTerms 接受 tx 参数并使用事务绑定的 Store，确保快照与写入同库
- auto_purchase.go 错误包装改用 pkgerrors.Wrap 而非标准库 errors
- shop_package_batch_allocation 去除 fmt 依赖改用 strconv 拼接
- shop_series_grant 提取 effectiveBase 局部变量避免重复调用
- 测试辅助函数统一迁移至 testutil.StringPointer，删除各文件本地重复定义
- 新增 testutil.NewRedisClient 和 testutil.StringPointer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/service/order/service.go

@@ -2223,7 +2223,7 @@ func (s *Service) markOrderCreated(ctx context.Context, idempotencyKey string, o
 
 // activateMainPackage 任务 8.2-8.4: 主套餐激活逻辑
 func (s *Service) activateMainPackage(ctx context.Context, tx *gorm.DB, order *model.Order, pkg *model.Package, carrierType string, carrierID uint, now time.Time) error {
-	terms, err := s.resolvePackageTerms(ctx, pkg, order.SellerShopID)
+	terms, err := s.resolvePackageTerms(ctx, tx, pkg, order.SellerShopID)
 	if err != nil {
 		s.logger.Error("生成套餐计时快照失败", zap.Uint("package_id", pkg.ID), zap.Error(err))
 		return err
@@ -2366,7 +2366,7 @@ func (s *Service) activateMainPackage(ctx context.Context, tx *gorm.DB, order *m
 
 // activateAddonPackage 任务 8.5-8.7: 加油包激活逻辑
 func (s *Service) activateAddonPackage(ctx context.Context, tx *gorm.DB, order *model.Order, pkg *model.Package, carrierType string, carrierID uint, now time.Time) error {
-	terms, err := s.resolvePackageTerms(ctx, pkg, order.SellerShopID)
+	terms, err := s.resolvePackageTerms(ctx, tx, pkg, order.SellerShopID)
 	if err != nil {
 		s.logger.Error("生成加油包计时快照失败", zap.Uint("package_id", pkg.ID), zap.Error(err))
 		return err
@@ -2446,10 +2446,13 @@ func (s *Service) activateAddonPackage(ctx context.Context, tx *gorm.DB, order *
 	return nil
 }
 
-func (s *Service) resolvePackageTerms(ctx context.Context, pkg *model.Package, sellerShopID *uint) (packagedomain.TermsSnapshot, error) {
+// resolvePackageTerms 在给定事务内查询分配覆盖并解析计时条款快照。
+// 必须在事务内调用，确保分配读取与 PackageUsage 写入在同一连接，避免快照与提交值不一致。
+func (s *Service) resolvePackageTerms(ctx context.Context, tx *gorm.DB, pkg *model.Package, sellerShopID *uint) (packagedomain.TermsSnapshot, error) {
 	var allocation *model.ShopPackageAllocation
 	if sellerShopID != nil && *sellerShopID > 0 {
-		found, err := s.shopPackageAllocationStore.GetByShopAndPackageForSystem(ctx, *sellerShopID, pkg.ID)
+		store := postgres.NewShopPackageAllocationStore(tx)
+		found, err := store.GetByShopAndPackageForSystem(ctx, *sellerShopID, pkg.ID)
 		if err != nil && err != gorm.ErrRecordNotFound {
 			return packagedomain.TermsSnapshot{}, errors.Wrap(errors.CodeDatabaseError, err, "查询套餐分配失败")
 		}

internal/service/shop_package_batch_allocation/service.go

@@ -2,7 +2,7 @@ package shop_package_batch_allocation
 
 import (
 	"context"
-	"fmt"
+	"strconv"
 
 	"github.com/break/junhong_cmp_fiber/internal/model"
 	"github.com/break/junhong_cmp_fiber/internal/model/dto"
@@ -94,7 +94,7 @@ func (s *Service) logExpiryBaseAudit(ctx context.Context, allocation *model.Shop
 	s.auditService.LogOperation(ctx, &model.AccountOperationLog{
 		OperatorID: middleware.GetUserIDFromContext(ctx), OperatorType: middleware.GetUserTypeFromContext(ctx),
 		OperatorName: middleware.GetUsernameFromContext(ctx), OperationType: "update_package_expiry_base",
-		OperationDesc: fmt.Sprintf("修改套餐分配生效条件覆盖: %d", allocation.ID),
+		OperationDesc: "修改套餐分配生效条件覆盖: " + strconv.FormatUint(uint64(allocation.ID), 10),
 		BeforeData:    model.JSONB{"allocation_id": allocation.ID, "expiry_base_override": before},
 		AfterData:     model.JSONB{"allocation_id": allocation.ID, "expiry_base_override": after},
 		RequestID:     middleware.GetRequestIDFromContext(ctx), IPAddress: middleware.GetIPFromContext(ctx), UserAgent: middleware.GetUserAgentFromContext(ctx),

internal/service/shop_series_grant/service.go

@@ -185,6 +185,7 @@ func (s *Service) buildGrantResponse(ctx context.Context, allocation *model.Shop
 		if pkg.IsGift {
 			continue
 		}
+		effectiveBase := packagepkg.EffectiveExpiryBase(pkg, pa)
 		packages = append(packages, dto.ShopSeriesGrantPackageItem{
 			PackageID:               pa.PackageID,
 			PackageName:             pkg.PackageName,
@@ -196,8 +197,8 @@ func (s *Service) buildGrantResponse(ctx context.Context, allocation *model.Shop
 			DefaultExpiryBaseName:   packagepkg.ExpiryBaseName(pkg.ExpiryBase),
 			ExpiryBaseOverride:      pa.ExpiryBaseOverride,
 			ExpiryBaseOverrideName:  packagepkg.ExpiryBaseOverrideName(pa.ExpiryBaseOverride),
-			EffectiveExpiryBase:     packagepkg.EffectiveExpiryBase(pkg, pa),
-			EffectiveExpiryBaseName: packagepkg.ExpiryBaseName(packagepkg.EffectiveExpiryBase(pkg, pa)),
+			EffectiveExpiryBase:     effectiveBase,
+			EffectiveExpiryBaseName: packagepkg.ExpiryBaseName(effectiveBase),
 		})
 	}
 	resp.Packages = packages