Feat:VolcEngine Model type add IMAGE2TEXT (#10629)

### What problem does this PR solve?
issue:
[#9004](https://github.com/infiniflow/ragflow/issues/9004)
change:
VolcEngine Model type add IMAGE2TEXT

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/user-setting/setting-model/volcengine-modal/index.tsx

@@ -81,6 +81,7 @@ const VolcEngineModal = ({
           <Select placeholder={t('modelTypeMessage')}>
             <Option value="chat">chat</Option>
             <Option value="embedding">embedding</Option>
+            <Option value="image2text">image2text</Option>
           </Select>
         </Form.Item>
         <Form.Item<FieldType>