ohos: change enableSelection to copyOption

[GithubGaoYang]

将 enableSelection 改为 copyOption

查看源码发现，enableSelection 仅用于设置 copyOption（源码），鉴于 CopyOptions 存在多个枚举值，只暴露 enableSelection 接口在使用上存在局限性，相比之下，暴露 CopyOptions 配置接口会更加灵活并便于开发者自定义复制选项。

[gemini-code-assist]

Summary of Changes

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此拉取请求旨在提升文本组件的复制功能灵活性。通过将单一的布尔开关 enableSelection 升级为支持多种枚举值的 copyOption，开发者现在可以更精确地控制文本的复制行为，例如指定复制到应用内或本地设备，从而增强了组件的可配置性和用户体验。

Highlights

• 优化文本复制选项配置: 将 ITextComponentSelectionOption 接口中的布尔类型 enableSelection 字段替换为更灵活的 CopyOptions 枚举类型 copyOption，从而允许开发者自定义更细粒度的复制行为。
• 更新 TextComponent 内部逻辑: 修改了 TextComponent 中 copyOption 的设置方式，直接使用 selectionOption.copyOption 的值，取代了之前基于 enableSelection 的条件判断。
• 示例代码同步更新: 在 board.ets 和 feature-detail.ets 示例文件中，更新了 onMarkdownTextComponentSelectionOption 回调，将 enableSelection: true 的用法迁移至 copyOption: CopyOptions.LocalDevice。

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Changelog

• HarmonyOS/markdown/src/main/ets/render/component/text.ets
  • 更新了 TextComponent 中 copyOption 的设置逻辑，直接使用 selectionOption.copyOption。
  • 在 ITextComponentSelectionOption 接口中，将 enableSelection 字段替换为 copyOption。
• HarmonyOS/playground/src/main/ets/pages/board.ets
  • 更新了 board 组件中 onMarkdownTextComponentSelectionOption 回调的实现，使用 copyOption: CopyOptions.LocalDevice。
• HarmonyOS/playground/src/main/ets/pages/feature-detail.ets
  • 更新了 feature-detail 组件中 onMarkdownTextComponentSelectionOption 回调的实现，使用 copyOption: CopyOptions.LocalDevice。

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Code Review

本次 PR 将 enableSelection 属性修改为 copyOption，以支持更灵活的文本复制选项。此变更涉及 ITextComponentSelectionOption 接口的更新，以及在 TextComponent 中处理该选项的逻辑。同时，Playground 示例中的相关用法也已相应更新。整体变更清晰，符合 PR 描述的目标。