Feature/macos screenshot - #18
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- 新增 macOS 截图完整实现（Swift）：选区/窗口吸附、编辑标注、马赛克、
长截图、圆角导出、保存对话框，行为与 Windows 版对齐
- 截图模块重构为 src/screenshot/{windows,macos,algo} 三层目录，
长截图拼接算法独立为平台无关的 algo 模块
- setClipboardFiles 支持 macOS；ScreenCapture.start 返回选区坐标与
错误信息，base64 结果带 data URL 前缀；长截图取消帧数上限
- 同步更新 binding.gyp、build-swift.sh、CI 构建流程与 README/DEPLOY 文档
PMv2 捕获线程下 GetSystemMetrics 已返回物理像素，dpiScale = physVw/vw 恒为 1，工具栏/面板界面尺寸乘它导致高分屏下保持 96 DPI 尺寸（过小）。 新增 LongCaptureContext.uiScale（GetDpiForSystem/96，与编辑态 CalcToolbarMetrics 同源）：工具栏窗口/布局/图标/tooltip 与面板窗口/ 内边距/圆角等界面 chrome 一律改用 uiScale；内容几何换算（rows/ds 标签、物理采样偏移、预览显示尺寸）保持 dpiScale 不变。 macOS 端 UI 以 point 布局、系统按 backing scale 自动渲染，无此问题。
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截图功能同步mac端实现，并修复了win端高分屏下长截图工具栏UI尺寸问题