feat: 知识库设置页面增加 retrieval_model 检索配置功能

1. 召回测试页面增加 Score 阈值参数配置
2. 知识库设置页面新增检索模型配置:
   - 检索方式 (向量/全文/混合/关键字检索)
   - Reranking 模型 (默认开启，不可关闭)
   - Top K 返回数量
   - Score 阈值 (默认开启，可调节数值)
3. 修复 Dify API 字段名问题 (retrieval_model_dict)
4. 优化数据加载流程，使用详情接口获取完整配置

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/components/dify-dataset-manager/retrieve-test.tsx

@@ -1,5 +1,5 @@
 import { SearchOutlined, FileSearchOutlined } from '@ant-design/icons';
-import { Button, Tag, Input, Slider, Spin, Select, Flex } from 'antd';
+import { Button, Tag, Input, Slider, Spin, Select, Flex, Switch, InputNumber, Tooltip } from 'antd';
 import type { RetrieveRecord } from '~/api/dify-dataset/type';
 import { useRetrieveTest } from '~/hooks/dify-dataset-manager/retrieve-test';
 import type { RetrieveTestProps } from '~/types/dify-dataset-manager/retrieve-test';
@@ -97,6 +97,10 @@ export default function RetrieveTest({ datasetId }: RetrieveTestProps) {
         setSearchMethod,
         topK,
         setTopK,
+        scoreThresholdEnabled,
+        setScoreThresholdEnabled,
+        scoreThreshold,
+        setScoreThreshold,
         handleRetrieve,
     } = useRetrieveTest(datasetId);
 
@@ -229,6 +233,46 @@ export default function RetrieveTest({ datasetId }: RetrieveTestProps) {
                             {topK}
                         </span>
                     </Flex>
+
+                    {/* Score 阈值设置 */}
+                    <Flex align="center" gap={12}>
+                        <Tooltip title="开启后，只返回相似度分数高于阈值的结果">
+                            <span style={{
+                                fontSize: 13,
+                                color: colors.textSecondary,
+                                whiteSpace: 'nowrap',
+                                cursor: 'help',
+                            }}>
+                                Score 阈值:
+                            </span>
+                        </Tooltip>
+                        <Switch
+                            size="small"
+                            checked={scoreThresholdEnabled}
+                            onChange={setScoreThresholdEnabled}
+                        />
+                        {scoreThresholdEnabled && (
+                            <>
+                                <Slider
+                                    value={scoreThreshold}
+                                    onChange={setScoreThreshold}
+                                    min={0}
+                                    max={1}
+                                    step={0.01}
+                                    style={{ flex: 1 }}
+                                />
+                                <InputNumber
+                                    value={scoreThreshold}
+                                    onChange={(value) => setScoreThreshold(value ?? 0.5)}
+                                    min={0}
+                                    max={1}
+                                    step={0.01}
+                                    size="small"
+                                    style={{ width: 70 }}
+                                />
+                            </>
+                        )}
+                    </Flex>
                 </Flex>
             </Flex>