工程名称下拉项获取兼容.md文件，同时新增自定义答案合成类

backend/app/engine/engine.py

@@ -10,6 +10,8 @@ from sqlalchemy import create_engine
 from util.register import *
 from app.engine.prompt import text_qa_template, refine_template, summary_template, simple_template
 from app.engine.retriever.HybridRetriever import HybridRetriever
+from app.engine.response.treeSummResponse import CustomTreeResponse
+from llama_index.core.settings import Settings
 
 ModelPlateCategory = '模型平台'
 
@@ -65,6 +67,14 @@ def get_Retriever(index,**kwargs):
     return retriever
 
 
+def get_synthesizer():
+    return CustomTreeResponse(
+            llm=Settings.llm,
+            summary_template=summary_template,
+            use_async=True,
+            streaming=False,
+    )
+
 sql_database = None
 sql_obj_index = None