fix(package-series): 将 enable_one_time_commission 字段提升到创建/更新请求顶层

- DTO: CreatePackageSeriesRequest 和 UpdatePackageSeriesRequest 添加 EnableOneTimeCommission 字段
- Service: Create/Update 方法处理顶层字段并同步到 JSON config 的 Enable 字段
- 确保顶层字段与 JSON config 内的 enable 保持一致，避免业务逻辑判断出错

internal/model/dto/package_series_dto.go

@@ -28,6 +28,7 @@ type CreatePackageSeriesRequest struct {
 	SeriesCode              string                            `json:"series_code" validate:"required,min=1,max=100" required:"true" minLength:"1" maxLength:"100" description:"系列编码"`
 	SeriesName              string                            `json:"series_name" validate:"required,min=1,max=255" required:"true" minLength:"1" maxLength:"255" description:"系列名称"`
 	Description             string                            `json:"description" validate:"omitempty,max=500" maxLength:"500" description:"描述"`
+	EnableOneTimeCommission *bool                             `json:"enable_one_time_commission" description:"是否启用一次性佣金"`
 	OneTimeCommissionConfig *SeriesOneTimeCommissionConfigDTO `json:"one_time_commission_config" validate:"omitempty" description:"一次性佣金规则配置"`
 }
 
@@ -35,6 +36,7 @@ type CreatePackageSeriesRequest struct {
 type UpdatePackageSeriesRequest struct {
 	SeriesName              *string                           `json:"series_name" validate:"omitempty,min=1,max=255" minLength:"1" maxLength:"255" description:"系列名称"`
 	Description             *string                           `json:"description" validate:"omitempty,max=500" maxLength:"500" description:"描述"`
+	EnableOneTimeCommission *bool                             `json:"enable_one_time_commission" description:"是否启用一次性佣金"`
 	OneTimeCommissionConfig *SeriesOneTimeCommissionConfigDTO `json:"one_time_commission_config" validate:"omitempty" description:"一次性佣金规则配置"`
 }