chore: remove petercat

[yvonneyx]

• fixed 官网的智能AI助手问什么都回答“ops... [object Object]” #7468

小预告：由 AntV 出品的 AI 答疑助手即将在 11.22 各大官网上线，三方 Petercat 没 key了😭先做下线处理。

[gemini-code-assist]

Summary of Changes

Hello @yvonneyx, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在移除站点配置文件中对第三方 Petercat 服务的引用。这是为了配合 AntV 团队即将推出的自有 AI 答疑助手，该助手将取代 Petercat，提供更集成和定制化的问答体验。通过此次清理，我们为新服务的上线做好了准备，并简化了项目配置。

Highlights

• 移除 Petercat 配置: 移除了 packages/site/.dumirc.ts 文件中关于 Petercat 的配置项，包括 show 和 token 属性。
• 为 AntV AI 答疑助手上线做准备: 此更改是为了配合 AntV 自研 AI 答疑助手即将于 11 月 22 日上线，届时将替代原有的第三方 Petercat 服务。

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[gemini-code-assist]

Code Review

本次变更按预期移除了 petercat 的相关配置。然而，这次提交暴露了一个严重的安全问题：源代码中存在硬编码的 API 令牌。尽管此令牌已被移除，但它仍然存在于 Git 的历史记录中。该令牌应被视为已泄露，并立即作废。建议对代码库进行审计，查找其他硬编码的密钥，并且未来应通过环境变量或密钥管理服务来管理此类敏感信息。

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.60%. Comparing base (38b8d16) to head (90de1d1).

Additional details and impacted files

@@           Coverage Diff           @@
##               v5    #7469   +/-   ##
=======================================
  Coverage   95.60%   95.60%           
=======================================
  Files         188      188           
  Lines        9874     9874           
  Branches     2131     2131           
=======================================
  Hits         9440     9440           
- Misses        402      434   +32     
+ Partials       32        0   -32     

Flag	Coverage Δ
g6	95.60% <ø> (ø)

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see 12 files with indirect coverage changes

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