Module client 

客户端模块入口点，提供统一的AI客户端接口和构建器

Client module entry point.

This module wires together the refactored client implementation that previously lived in the monolithic src/client.rs.

Structs

AiClient

统一的AI客户端，提供跨厂商的AI服务访问接口

AiClientBuilder

AI client builder with progressive custom configuration

CancelHandle

Streaming response cancel handle

ModelOptions

Model configuration options for explicit model selection

Enums

Provider