docs: remove duplicated project structure sections from READMEs

[CJackHwang]

Motivation

• The main README files included a duplicated "项目结构" / "Project Structure" section that duplicates the authoritative architecture docs in docs/ARCHITECTURE.md and docs/ARCHITECTURE.en.md.
• Remove the duplicated block to keep the top-level README focused on onboarding and to avoid split maintenance of project structure information.

Description

• Delete the ## 项目结构 block from README.MD and the ## Project Structure block from README.en.md so the README delegates structure details to docs/ARCHITECTURE*.md.
• Preserve surrounding content and the documentation index so the READMEs still provide onboarding and links to detailed docs.

Testing

• No automated tests were run because this is a documentation-only change and does not affect runtime code.
• Performed quick verification that the removed sections no longer appear by searching the READMEs and inspecting the resulting diffs (rg/git diff).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
ds2api	Ready	Preview, Comment	Apr 7, 2026 4:33am