docs(api): add TypeA and TypeB API docs
Add two API design documents: 接口文档_TypeA.md (comprehensive v1 API spec) and 接口文档_TypeB.md (Juwan API design).
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Add two API design documents: 接口文档_TypeA.md (comprehensive v1 API spec) and 接口文档_TypeB.md (Juwan API design).