docs: 获取公钥API文档 (closed #2303)

[Huayeaaa]

PR

CheckList（PR Assigners）

确认已完成以下操作：

• 已将分支与当前合入分支同步
• 已在关联 Issue 中补充「功能自测」部分内容
• 已更新关联 Issue 的状态 backlog -> todo -> for test -> tested（需通过测试同学测试） -> done
• 将 PR 添加上 pr/reviewable

CheckList（PR Reviewers）

确认已完成以下操作：

• 检查关联 Issue 「功能自测」部分内容
• 必要时打回 pr/reviewable，要求重新修改
• 及时 Approve

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (v2.4.7-dev@b00d9dd). Learn more about missing BASE report.

Additional details and impacted files

@@              Coverage Diff              @@
##             v2.4.7-dev    #2304   +/-   ##
=============================================
  Coverage              ?   75.13%           
=============================================
  Files                 ?      405           
  Lines                 ?    28948           
  Branches              ?        0           
=============================================
  Hits                  ?    21750           
  Misses                ?     7198           
  Partials              ?        0           

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