需求可视化-外围系统交互流程图-APP端建额

目的在于澄清系统边界、交互路径、交互点，这个“外围”可以是外部系统，也可以是内部的微服务。通常是在首次构建应用时需与关联方对齐，以客户从APP端建额为例，交互流程样例大致如下：

The goal is to clarify system boundaries, interaction paths, and interaction points. This "periphery" can be an external system or an internal microservice. Usually, this alignment with stakeholders is needed when initially building an application. Taking the customer's credit limit creation from the APP end as an example, the interaction flow example is roughly as follows: