Remove CLI release workflow and version sync logic

[libpag-bot]

移除 CLI 发布相关的自动化配置：

• 删除 release-cli.yml GitHub Actions workflow，该 workflow 用于在多平台构建 pagx CLI 并发布到 npm
• 移除 publish.js 中的 CLI 版本同步逻辑（getCliVersion、updateSkillCliVersion 函数），这些函数用于自动将 cli/npm/package.json 版本同步到 skill 文档

CLI 包本身（cli/npm/）保持不变，仅移除自动化发布和版本同步机制。

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.17%. Comparing base (0dd6334) to head (f6d61c2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3325      +/-   ##
==========================================
- Coverage   75.25%   75.17%   -0.09%     
==========================================
  Files         503      503              
  Lines       33299    33299              
  Branches    10739    10739              
==========================================
- Hits        25060    25031      -29     
- Misses       6031     6039       +8     
- Partials     2208     2229      +21     

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