add support for TTS model (#2095)

### What problem does this PR solve?

add support for TTS model
#1853

### Type of change

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

---------

Co-authored-by: Zhedong Cen <cenzhedong2@126.com>
Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

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

@@ -83,6 +83,13 @@ const SystemModelSettingModal = ({
         >
           <Select options={allOptions[LlmModelType.Rerank]} />
         </Form.Item>
+        <Form.Item
+          label={t('ttsModel')}
+          name="tts_id"
+          tooltip={t('ttsModelTip')}
+        >
+          <Select options={allOptions[LlmModelType.TTS]} />
+        </Form.Item>
       </Form>
     </Modal>
   );