fix(poll): Series 删除前检查关联套餐 POLL-04

- package_store.go 新增 CountBySeriesID 方法，统计指定系列下的活跃套餐数量
- package_series/service.go Service 注入 packageStore 字段，Delete 前调用 CountBySeriesID 检查
- bootstrap/services.go 更新 PackageSeries 服务初始化，传入 PackageStore

internal/bootstrap/services.go

@@ -159,7 +159,7 @@ func initServices(s *stores, deps *Dependencies) *services {
 		DeviceImport:               deviceImportSvc.New(deps.DB, s.DeviceImportTask, deps.QueueClient),
 		AssetAllocationRecord:      assetAllocationRecordSvc.New(deps.DB, s.AssetAllocationRecord, s.Shop, s.Account),
 		Carrier:                    carrierSvc.New(s.Carrier),
-		PackageSeries:              packageSeriesSvc.New(s.PackageSeries, s.ShopSeriesAllocation),
+		PackageSeries:              packageSeriesSvc.New(s.PackageSeries, s.ShopSeriesAllocation, s.Package),
 		Package:                    packageSvc.New(s.Package, s.PackageSeries, s.ShopPackageAllocation, s.ShopSeriesAllocation),
 		PackageDailyRecord:         packageSvc.NewDailyRecordService(deps.DB, deps.Redis, s.PackageUsageDailyRecord, deps.Logger),
 		PackageCustomerView:        packageSvc.NewCustomerViewService(deps.DB, deps.Redis, s.PackageUsage, deps.Logger),

internal/service/package_series/service.go

@@ -2,6 +2,7 @@ package package_series
 
 import (
 	"context"
+	"fmt"
 	"time"
 
 	"gorm.io/gorm"
@@ -15,15 +16,19 @@ import (
 	"github.com/break/junhong_cmp_fiber/pkg/middleware"
 )
 
+// Service 套餐系列业务服务
 type Service struct {
 	packageSeriesStore        *postgres.PackageSeriesStore
 	shopSeriesAllocationStore *postgres.ShopSeriesAllocationStore
+	packageStore              *postgres.PackageStore
 }
 
-func New(packageSeriesStore *postgres.PackageSeriesStore, shopSeriesAllocationStore *postgres.ShopSeriesAllocationStore) *Service {
+// New 创建套餐系列服务实例
+func New(packageSeriesStore *postgres.PackageSeriesStore, shopSeriesAllocationStore *postgres.ShopSeriesAllocationStore, packageStore *postgres.PackageStore) *Service {
 	return &Service{
 		packageSeriesStore:        packageSeriesStore,
 		shopSeriesAllocationStore: shopSeriesAllocationStore,
+		packageStore:              packageStore,
 	}
 }
 
@@ -139,6 +144,14 @@ func (s *Service) Delete(ctx context.Context, id uint) error {
 		return errors.Wrap(errors.CodeInternalError, err, "获取套餐系列失败")
 	}
 
+	count, err := s.packageStore.CountBySeriesID(ctx, id)
+	if err != nil {
+		return err
+	}
+	if count > 0 {
+		return errors.New(errors.CodeInvalidParam, fmt.Sprintf("该系列下有 %d 个关联套餐，请先处理后再删除", count))
+	}
+
 	if err := s.packageSeriesStore.Delete(ctx, id); err != nil {
 		return errors.Wrap(errors.CodeInternalError, err, "删除套餐系列失败")
 	}

internal/store/postgres/package_store.go

@@ -8,6 +8,7 @@ import (
 	"github.com/break/junhong_cmp_fiber/internal/model"
 	"github.com/break/junhong_cmp_fiber/internal/store"
 	"github.com/break/junhong_cmp_fiber/pkg/constants"
+	"github.com/break/junhong_cmp_fiber/pkg/errors"
 	"github.com/break/junhong_cmp_fiber/pkg/middleware"
 )
 
@@ -135,3 +136,15 @@ func (s *PackageStore) GetByIDsUnscoped(ctx context.Context, ids []uint) ([]*mod
 	}
 	return packages, nil
 }
+
+// CountBySeriesID 统计指定系列下的活跃套餐数量（未软删除）
+func (s *PackageStore) CountBySeriesID(ctx context.Context, seriesID uint) (int64, error) {
+	var count int64
+	err := s.db.WithContext(ctx).Model(&model.Package{}).
+		Where("series_id = ? AND deleted_at IS NULL", seriesID).
+		Count(&count).Error
+	if err != nil {
+		return 0, errors.Wrap(errors.CodeDatabaseError, err, "统计关联套餐失败")
+	}
+	return count, nil
+}