release v0.4.0

- 更新 README 和用户手册，增加 Vosk 引擎的使用说明
- 修改构建配置，支持 Vosk 引擎的打包
- 更新版本号至 0.4.0，准备发布新功能

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "auto-caption",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "auto-caption",
-      "version": "0.3.0",
+      "version": "0.4.0",
       "hasInstallScript": true,
       "dependencies": {
         "@electron-toolkit/preload": "^3.0.1",