feat(engine): 优化字幕引擎输出格式、准备合并两个字幕引擎

- 重构字幕引擎相关代码
- 准备合并两个字幕引擎

package.json

@@ -13,7 +13,7 @@
     "typecheck:web": "vue-tsc --noEmit -p tsconfig.web.json --composite false",
     "typecheck": "npm run typecheck:node && npm run typecheck:web",
     "start": "electron-vite preview",
-    "dev": "electron-vite dev",
+    "dev": "chcp 65001 && electron-vite dev",
     "build": "npm run typecheck && electron-vite build",
     "postinstall": "electron-builder install-app-deps",
     "build:unpack": "npm run build && electron-builder --dir",
@@ -35,6 +35,7 @@
     "@electron-toolkit/eslint-config-ts": "^3.0.0",
     "@electron-toolkit/tsconfig": "^1.0.1",
     "@types/node": "^22.14.1",
+    "@types/pidusage": "^2.0.5",
     "@vitejs/plugin-vue": "^5.2.3",
     "electron": "^35.1.5",
     "electron-builder": "^25.1.8",