docs: add i18n support with Chinese as default language

- Configure VitePress locales with zh-CN as root and en-US as /en/
- Translate all documentation to Chinese (31 files)
- Create English documentation under /en/ directory
- Add Chinese UI labels for navigation and pagination
- Language switcher now available in site header

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

docs/config/program.md

@@ -1,25 +1,25 @@
-# Program Settings
+# 程序设置
 
-## WebUI Configuration
+## WebUI 配置
 
 ![program](../image/config/program.png){width=500}{class=ab-shadow-card}
 
 <br/>
 
-- Interval Time parameters are in seconds. Convert to seconds if you need to set minutes.
-- RSS is the RSS check interval, which affects how often automatic download rules are generated.
-- Rename is the rename check interval. Modify this if you need to change how often renaming is checked.
-- WebUI Port is the port number. Note that if you're using Docker, you need to remap the port in Docker after changing it.
+- 时间间隔参数的单位为秒。如需设置分钟，请换算为秒。
+- RSS 为 RSS 检查间隔，影响自动下载规则的生成频率。
+- 重命名为重命名检查间隔，如需调整重命名检查频率可修改此项。
+- WebUI 端口为端口号。注意：如果使用 Docker，更改端口后需要在 Docker 中重新映射端口。
 
 
-## `config.json` Configuration Options
+## `config.json` 配置选项
 
-The corresponding options in the configuration file are:
+配置文件中的对应选项如下：
 
-Configuration section: `program`
+配置节：`program`
 
-| Parameter   | Description          | Type            | WebUI Option         | Default |
-|-------------|---------------------|-----------------|---------------------|---------|
-| rss_time    | RSS check interval  | Integer (seconds) | RSS check interval  | 7200    |
-| rename_time | Rename check interval | Integer (seconds) | Rename check interval | 60    |
-| webui_port  | WebUI port          | Integer         | WebUI port          | 7892    |
+| 参数        | 说明           | 类型          | WebUI 选项        | 默认值 |
+|-------------|----------------|---------------|-------------------|--------|
+| rss_time    | RSS 检查间隔   | 整数（秒）    | RSS 检查间隔      | 7200   |
+| rename_time | 重命名检查间隔 | 整数（秒）    | 重命名检查间隔    | 60     |
+| webui_port  | WebUI 端口     | 整数          | WebUI 端口        | 7892   |