Add bot-review mode for CI/CD non-interactive PR code review.

[kevingpqi123]

为 /cr 技能添加 bot 模式，支持在 CI/CD 流水线中进行非交互式 PR 代码审查。

主要变更：

• 新增 bot-review.md 参考文档，定义 bot 模式的完整审查流程
• 更新 SKILL.md 路由表，添加 bot 模式入口
• bot 模式使用 reviewer-verifier 对抗机制确保审查质量
• 审查结果以行级评论形式发布到 PR

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.78%. Comparing base (ce1c42f) to head (758d47f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3300      +/-   ##
==========================================
+ Coverage   74.76%   74.78%   +0.02%     
==========================================
  Files         501      501              
  Lines       32765    32765              
  Branches    10701    10701              
==========================================
+ Hits        24496    24503       +7     
+ Misses       6059     6055       -4     
+ Partials     2210     2207       -3     

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