Updated Design (markdown)
docs: SRS 升版 V1.4(Java 运行环境 + 前端预校验条款),Design 升版 V1.3(修正校验职责矛盾、统一上游引用)
docs: update design for Java refactor Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Update trade flow design Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Created Design (markdown)