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/hooks/dify-dataset-manager/retrieve-test.ts

@@ -9,7 +9,12 @@ import type { SearchMethod } from '~/types/dify-dataset-manager/retrieve-test';
  * 构建完整的 retrieval_model 参数（匹配 Dify API 规范）
  * 根据检索方式启用 Reranking（语义搜索和混合搜索需要启用）
  */
-function buildRetrievalModel(searchMethod: SearchMethod, topK: number): RetrievalModel {
+function buildRetrievalModel(
+    searchMethod: SearchMethod,
+    topK: number,
+    scoreThresholdEnabled: boolean,
+    scoreThreshold: number
+): RetrievalModel {
     // 语义搜索和混合搜索需要启用 Reranking
     const needReranking = searchMethod === 'semantic_search' || searchMethod === 'hybrid_search';
 
@@ -23,8 +28,8 @@ function buildRetrievalModel(searchMethod: SearchMethod, topK: number): Retrieva
         },
         weights: null,
         top_k: topK,
-        score_threshold_enabled: false,
-        score_threshold: null,
+        score_threshold_enabled: scoreThresholdEnabled,
+        score_threshold: scoreThresholdEnabled ? scoreThreshold : null,
     };
 }
 
@@ -38,6 +43,9 @@ export function useRetrieveTest(datasetId: string) {
     // 默认使用语义搜索
     const [searchMethod, setSearchMethod] = useState<SearchMethod>('semantic_search');
     const [topK, setTopK] = useState<number>(5);
+    // Score 阈值相关状态
+    const [scoreThresholdEnabled, setScoreThresholdEnabled] = useState(false);
+    const [scoreThreshold, setScoreThreshold] = useState<number>(0.5);
 
     /**
      * 执行检索
@@ -55,7 +63,7 @@ export function useRetrieveTest(datasetId: string) {
 
         setRetrieving(true);
         try {
-            const retrievalModel = buildRetrievalModel(searchMethod, topK);
+            const retrievalModel = buildRetrievalModel(searchMethod, topK, scoreThresholdEnabled, scoreThreshold);
             console.log('[Hook] 检索参数:', { datasetId, query: searchQuery, retrievalModel });
 
             const response = await retrieveDataset(datasetId, searchQuery, retrievalModel);
@@ -69,7 +77,7 @@ export function useRetrieveTest(datasetId: string) {
         } finally {
             setRetrieving(false);
         }
-    }, [datasetId, searchQuery, searchMethod, topK]);
+    }, [datasetId, searchQuery, searchMethod, topK, scoreThresholdEnabled, scoreThreshold]);
 
     return {
         // 状态
@@ -81,6 +89,10 @@ export function useRetrieveTest(datasetId: string) {
         setSearchMethod,
         topK,
         setTopK,
+        scoreThresholdEnabled,
+        setScoreThresholdEnabled,
+        scoreThreshold,
+        setScoreThreshold,
 
         // 方法
         handleRetrieve,