feat: Refine reteival of multi-turn conversation #2362 (#2539)

### What problem does this PR solve?

feat: Refine reteival of multi-turn conversation #2362

### Type of change

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

web/src/locales/en.ts

@@ -435,6 +435,9 @@ The above is the content you need to summarize.`,
         'To play the voice using voice conversion, please select TTS (speech conversion model) in the settings first.',
       relatedQuestion: 'Related question',
       answerTitle: 'R',
+      multiTurn: 'Multi-trun optimization',
+      multiTurnTip:
+        'In multi-round conversations, the query to the knowledge base is optimized. The large model will be called to consume additional tokens.',
     },
     setting: {
       profile: 'Profile',

web/src/locales/zh-traditional.ts

@@ -404,6 +404,9 @@ export default {
       ttsTip: '是否用語音轉換播放語音，請先在設定裡面選擇TTS（語音轉換模型）。',
       relatedQuestion: '相關問題',
       answerTitle: '智慧回答',
+      multiTurn: '多輪對話優化',
+      multiTurnTip:
+        '在多輪對話的中，對去知識庫查詢的問題進行最佳化。會呼叫大模型額外消耗token。',
     },
     setting: {
       profile: '概述',

web/src/locales/zh.ts

@@ -421,6 +421,9 @@ export default {
       ttsTip: '是否用语音转换播放语音，请先在设置里面选择TTS（语音转换模型）。',
       relatedQuestion: '相关问题',
       answerTitle: '智能回答',
+      multiTurn: '多轮对话优化',
+      multiTurnTip:
+        '在多轮对话的中，对去知识库查询的问题进行优化。会调用大模型额外消耗token。',
     },
     setting: {
       profile: '概要',

web/src/pages/chat/chat-configuration-modal/prompt-engine.tsx

@@ -160,6 +160,14 @@ const PromptEngine = (
       <Divider></Divider>
       <SimilaritySlider isTooltipShown></SimilaritySlider>
       <TopNItem></TopNItem>
+      <Form.Item
+        label={t('multiTurn')}
+        tooltip={t('multiTurnTip')}
+        name={['prompt_config', 'refine_multiturn']}
+        initialValue={true}
+      >
+        <Switch></Switch>
+      </Form.Item>
       <Rerank></Rerank>
       <section className={classNames(styles.variableContainer)}>
         <Row align={'middle'} justify="end">