feat(i18n): 后端添加国际化支持、优化前端界面

- 后端添加并实现国际化支持
- 前端引入 vue-i18n 模块（尚未添加国际化逻辑）
- 优化用户界面样式，统一输入框和标签样式

README_en.md

@@ -8,6 +8,8 @@
     </p>
 </div>
 
+<p style="color:red;text-align:center;">The development of the new version is underway, featuring a local subtitle engine, English/Japanese internationalization, and a dark theme. It will also include fixes for known bugs and improvements to the user experience. It is expected to be released within this month.</p>
+
 ![](./assets/media/main.png)
 
 ## ⚠️ Attention
@@ -110,4 +112,4 @@ npm run build:win
 npm run build:mac
 # For Linux
 npm run build:linux
-```
+```