i18n(ui): clarify preview build and extended image-recognition copy

Notes the preview build as unofficial in the conversation hero and describes the
image-recognition plugin as an extension beyond the official DeepSeek surface.

Co-Authored-By: Claude <noreply@anthropic.com>

packages/client/ui-settings-plugins/src/client/locales.ts

@@ -106,8 +106,8 @@ export const zh: Record<PluginsSettingsLocaleKey, string> = {
   webSearchBaseUrlHint: '留空则使用提供方默认地址。',
   webSearchMaxUses: '单次请求最多搜索次数',
   webSearchMaxUsesHint: '一次请求在必须作答前最多可以搜索多少次。',
-  imageRecognitionTitle: '图像识别',
-  imageRecognitionDescription: '图像识别的视觉提供方。',
+  imageRecognitionTitle: '图像识别（官方之外的新增）',
+  imageRecognitionDescription: '图像识别的视觉提供方。为deepSeek补充视觉能力',
   imageRecognitionApiKey: 'API Key',
   imageRecognitionApiKeyHint: '不写入设置文件。留空表示保持当前密钥。',
   imageRecognitionApiKeySet: '已配置密钥。',