Module reason 

Reason-layer enums and traits.

Enums

ConfErrReason

Configuration error sub-classification 配置错误子分类

ErrorCategory

UvsReason

Universal error reason classification with clear hierarchical structure 统一错误原因分类 - 采用清晰的分层结构

Traits

DomainReason

ErrorCode

Legacy numeric error code.

ErrorIdentityProvider

UvsFrom

Unified constructor helpers for types that can be converted from UvsReason.