查询结果支持复制为 Markdown

[Shikanor]

功能说明

SQL 查询页每个「执行结果」标签页的工具栏新增**「复制为Markdown」**按钮，一键将当前查询结果复制为 Markdown 表格文本，便于粘贴到 Wiki、邮件、IM 等场景。

实现说明

• 基于 bootstrap-table 1.22 的自定义 buttons 选项实现，按钮样式与工具栏原生按钮一致（按钮 HTML 通过 html 字段自定义，规避 showButtonText 默认关闭导致文本不渲染的问题）
• 取数口径与页面显示一致：getVisibleColumns（隐藏列不参与）+ getData（全量数据）；数组/对象值 JSON.stringify，null/undefined 显示为 (null)（与表格 undefinedText 口径一致）
• Markdown 转义：单元格中的 \ 与 | 先后转义、换行替换为空格，保证粘贴后表格结构不被破坏
• 纯前端实现：无后端/API 变更、无新增依赖，单文件改动

兼容性

• 复制优先使用 Clipboard API；HTTP 内网部署（非安全上下文）下自动回退 document.execCommand(copy)，并恢复页面焦点
• 生成与复制过程中的同步异常均有兜底，按钮状态始终可恢复（成功提示「已复制」/失败提示「复制失败」）

测试

• 本地部署实测：含 null、竖线、换行、JSON、中文样本数据，复制后 Markdown 表格渲染正常
• HTTP 非安全上下文（execCommand 回退路径）实测通过

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.70%. Comparing base (7faf9a8) to head (515c256).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3257   +/-   ##
=======================================
  Coverage   88.70%   88.70%           
=======================================
  Files         158      158           
  Lines       29780    29780           
=======================================
  Hits        26415    26415           
  Misses       3365     3365           

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 7a812073e5

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• Open a pull request for review
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[Shikanor]

感谢 review，5 条意见（2×P1、3×P2）均已在 515c256 处理，详见各行内回复：按钮按 can_download 门控（含建表语句结果页）、复制成功记录独立审计动作「复制Markdown」、标题不再剔除尖括号别名、剪贴板写入移回用户手势任务内（Safari 兼容）。

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 515c2564a0

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".