docs: 补充整体架构与内部服务图

[xiaocheny214]

Summary

• 增加两张可直接打开的架构图：整体架构（外部调用）与内部服务。
• 整体架构覆盖浏览器 → Nginx → FastAPI，以及 Redis Stream、独立 Worker、AI Gateway 出站。
• 内部服务覆盖项目/鉴权/积分、前端节点编排与 Agent、任务调度、资产后处理，以及浏览器三渲二出帧。
• JSON 为源文件，HTML 为独立查看器；入口见 docs/architecture/README.md。

Test plan

• 仅纳入上述两张图的 JSON / HTML 与 README，未夹带 visual-check 截图或其他模块图
• 浏览器打开 docs/architecture/windup-system.html，确认外部调用路径可读
• 浏览器打开 docs/architecture/windup-internals.html，确认内部服务与双出帧路径可读

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
windup	Ignored	Preview	Aug 29, 2026 2:15am

[github-actions]

⚠️ @xiaocheny214，此 PR 尚未关联 issue。请在 PR 描述中使用 Closes #123 等关闭关键字；更新描述后，此提醒将自动标记为已解决。

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #926      +/-   ##
==========================================
+ Coverage   86.51%   91.27%   +4.76%     
==========================================
  Files         300      193     -107     
  Lines       23175    13204    -9971     
  Branches     3437        0    -3437     
==========================================
- Hits        20049    12052    -7997     
+ Misses       2172     1152    -1020     
+ Partials      954        0     -954     

Flag	Coverage Δ
backend	91.27% <ø> (-0.04%)	⬇️
frontend	?

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[fennoai]

审阅了新增的整体架构与内部服务图、对应 JSON 源文件及 HTML 交互产物。图表结构、节点引用、源文件行号和 HTML/JSON 的引用数量保持一致；但源证据链接存在一个会阻断验证流程的问题，见内联评论。