feat(手机号资产关联): AUG26-009 手机号—资产关联、十项上限与后台解绑

- 新增成对迁移 000223（tb_phone_asset_association，含有效关系部分唯一索引与 down 守卫）与 000224（解绑导入任务表），不回填历史
- H5：need_bind_phone 三支判定（开关关闭完全短路）；已有主号幂等建联；十项上限按手机号 advisory 串行化（含换绑到全新号的并发场景）；换绑原子迁移与冲突整单回滚；不写遗留列
- 后台：关联列表、单项/批量解绑、CSV 导入解绑（B1–B16），超管/平台 gate + 资产数据范围复核，三态统一文案
- 读侧：卡/设备列表与详情按页一次 IN 聚合；两类导出补「关联手机号」列并保留历史表头反解兼容
- 脱敏：关联审计走独立动作/资源只写脱敏手机号；访问日志手机号类字段脱敏
- 同步主 Spec openspec/specs/phone-asset-association 并归档 AUG26-009，补齐 requirement-evidence 与入口矩阵，context-health 通过

pkg/storage/service.go

@@ -36,7 +36,7 @@ func (s *Service) GenerateFileKey(purpose, fileName string) (string, error) {
 	if ext == "" {
 		ext = ".bin"
 	}
-	if (purpose == constants.StoragePurposeAssetPackageBatchOrder || purpose == constants.StoragePurposeDeviceBatchAllocation || purpose == constants.StoragePurposeShopBusinessOwnerImport) && !strings.EqualFold(ext, ".csv") {
+	if (purpose == constants.StoragePurposeAssetPackageBatchOrder || purpose == constants.StoragePurposeDeviceBatchAllocation || purpose == constants.StoragePurposeShopBusinessOwnerImport || purpose == constants.StoragePurposePhoneAssetUnbindImport) && !strings.EqualFold(ext, ".csv") {
 		return "", errors.New(errors.CodeInvalidParam, "批量业务文件必须为CSV格式")
 	}
 

pkg/storage/types.go

@@ -22,4 +22,7 @@ var PurposeMappings = map[string]PurposeMapping{
 	constants.StoragePurposeShopBusinessOwnerImport: {
 		Prefix: constants.ShopBusinessOwnerImportStoragePrefix, ContentType: "text/csv",
 	},
+	constants.StoragePurposePhoneAssetUnbindImport: {
+		Prefix: constants.PhoneAssetUnbindImportStoragePrefix, ContentType: "text/csv",
+	},
 }