fix: 修复梯度佣金档位字段缺失，补全授权接口响应字段及强充有效状态

- OneTimeCommissionTierDTO 补充 operator 字段映射
- GrantCommissionTierItem 补充 dimension/stat_scope 字段（从全局配置合并）
- 系列授权列表/详情补充强充锁定状态和强充金额的有效值计算
- 同步 OpenSpec 主规范并归档变更文档

internal/service/package_series/service.go

@@ -263,6 +263,7 @@ func (s *Service) dtoToModelConfig(dtoConfig *dto.SeriesOneTimeCommissionConfigD
 		tiers = make([]model.OneTimeCommissionTier, len(dtoConfig.Tiers))
 		for i, tier := range dtoConfig.Tiers {
 			tiers[i] = model.OneTimeCommissionTier{
+				Operator:  tier.Operator,
 				Dimension: tier.Dimension,
 				StatScope: tier.StatScope,
 				Threshold: tier.Threshold,
@@ -296,6 +297,7 @@ func (s *Service) modelToDTO(config *model.OneTimeCommissionConfig) *dto.SeriesO
 		tiers = make([]dto.OneTimeCommissionTierDTO, len(config.Tiers))
 		for i, tier := range config.Tiers {
 			tiers[i] = dto.OneTimeCommissionTierDTO{
+				Operator:  tier.Operator,
 				Dimension: tier.Dimension,
 				StatScope: tier.StatScope,
 				Threshold: tier.Threshold,