refactor(caption): 重构字幕引擎结构、修复字幕引擎空置报错 (#2)

- 修复gummy字幕引擎长时间空置报错的问题
- 将 python-subprocess 文件夹重命名为 caption-engine
- 删除未使用的 prototype 代码

src/main/utils/CaptionEngine.ts

@@ -37,13 +37,13 @@ export class CaptionEngine {
       if (is.dev) {
         this.appPath = path.join(
           app.getAppPath(),
-          'python-subprocess', 'dist', gummyName
+          'caption-engine', 'dist', gummyName
         )
       }
       else {
         this.appPath = path.join(
           process.resourcesPath,
-          'python-subprocess', 'dist', gummyName
+          'caption-engine', 'dist', gummyName
         )
       }
       this.command = []