feat(engine): 添加字幕引擎资源消耗监控功能

- 在控制窗口添加引擎状态显示，包括 PID、PPID、CPU 使用率、内存使用量和运行时间
- 优化字幕记录导出和复制功能，支持选择导出内容类型

src/main/ControlWindow.ts

@@ -1,5 +1,7 @@
 import { shell, BrowserWindow, ipcMain, nativeTheme, dialog } from 'electron'
 import path from 'path'
+import { EngineInfo } from './types'
+import pidusage from 'pidusage'
 import { is } from '@electron-toolkit/utils'
 import icon from '../../build/icon.png?asset'
 import { captionWindow } from './CaptionWindow'
@@ -81,6 +83,20 @@ class ControlWindow {
       return result.filePaths[0];
     })
 
+    ipcMain.handle('control.engine.info', async () => {
+      const info: EngineInfo = {
+        pid: 0, ppid: 0, cpu: 0, mem: 0, elapsed: 0
+      }
+      if(captionEngine.processStatus !== 'running') return info
+      const stats = await pidusage(captionEngine.process.pid)
+      info.pid = stats.pid
+      info.ppid = stats.ppid
+      info.cpu = stats.cpu
+      info.mem = stats.memory
+      info.elapsed = stats.elapsed
+      return info
+    })
+
     ipcMain.on('control.uiLanguage.change', (_, args) => {
       allConfig.uiLanguage = args
       if(captionWindow.window){