优化DifyCompareTest类，添加DifyExporter实例以支持词条检索，更新DifyQueryRetrieval_api.py中的topk参数，增强DifyExporter类以从HTTP服务获取查询类型和点踩原因，简化构造函数，移除不必要的查询日志加载逻辑。

rag2_0/dify/DifyQueryRetrieval_api.py

@@ -5,7 +5,7 @@ import os
 from fastapi import FastAPI, HTTPException, Request
 from fastapi.responses import JSONResponse
 from fastapi.middleware.cors import CORSMiddleware
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, ConfigDict
 from typing import Dict, List, Any, Optional
 import asyncio
 
@@ -43,6 +43,7 @@ class RetrieveRequest(BaseModel):
     query_list: str
     data_set_list: str
     query_expand_dict: dict | str = Field(default="{}")
+    topk: int = Field(default=4)
 
 # 创建FastAPI应用
 app = FastAPI(
@@ -102,7 +103,7 @@ async def retrieve(request: RetrieveRequest):
             query_list, 
             data_set_list,
             query_expand_dict=query_expand_dict,
-            top_k=4
+            top_k=request.topk
         )
         end_time = time.time()