feat: 提权会话复用，5 分钟内免密 - #2
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osascript 的 do shell script ... with administrator privileges 不做任何 缓存，每次执行都是全新的 Authorization 会话，所以每次都弹密码框。 改为持有一个 AuthorizationRef 并在 App 生命周期内复用：首次执行时 AuthorizationCopyRights 弹一次框，之后在 system.privilege.admin 的 默认有效期（5 分钟）内直接复用，不再弹。 AuthorizationExecuteWithPrivileges 在 Swift 里被标为 unavailable， 运行时用 dlsym 取函数指针调用；取不到则回退到原来的 osascript 路径。 该 API 拿不到子进程退出码，改用 shell 里的 rc 变量 + 输出标记回传。 界面在需要提权时显示授权剩余秒数，并提供「释放」按钮立即失效。 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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osascript 的 do shell script ... with administrator privileges 不做任何 缓存，每次执行都是全新的 Authorization 会话，所以每次都弹密码框。
改为持有一个 AuthorizationRef 并在 App 生命周期内复用：首次执行时
AuthorizationCopyRights 弹一次框，之后在 system.privilege.admin 的 默认有效期（5 分钟）内直接复用，不再弹。
AuthorizationExecuteWithPrivileges 在 Swift 里被标为 unavailable， 运行时用 dlsym 取函数指针调用；取不到则回退到原来的 osascript 路径。
该 API 拿不到子进程退出码，改用 shell 里的 rc 变量 + 输出标记回传。
界面在需要提权时显示授权剩余秒数，并提供「释放」按钮立即失效。