修改readme

backend/app/main_graph/utils/rag_initializer.py

@@ -20,12 +20,11 @@ def is_initialized() -> bool:
     return _initialized
 
 
-async def init_rag_tool(local_llm_creator, force: bool = False):
+async def init_rag_tool(force: bool = False):
     """
-    初始化 RAG 工具（注册到模块级变量）
+    初始化 RAG 工具（注册到模块级变量，内部获取所需服务）
 
     Args:
-        local_llm_creator: 返回 LLM 实例的函数
         force: 是否强制重新初始化
 
     Returns:
@@ -39,20 +38,22 @@ async def init_rag_tool(local_llm_creator, force: bool = False):
         return _rag_tool
 
     try:
+        from app.model_services.chat_services import get_chat_service
+
         info("🔄 正在初始化 RAG 检索系统...")
         embeddings = get_embedding_service()
         retriever = create_parent_hybrid_retriever(
             collection_name="rag_documents",
             search_k=5,
-            embeddings=embeddings
+            embeddings=embeddings,
         )
-        rewrite_llm = local_llm_creator()
+        rewrite_llm = get_chat_service()
 
         rag_tool = create_rag_tool(
             retriever=retriever,
             llm=rewrite_llm,
             num_queries=3,
-            rerank_top_n=5
+            rerank_top_n=5,
         )
 
         _rag_tool = rag_tool