feat: add api for knowledge_based QA

chains/local_doc_qa.py

@@ -18,6 +18,9 @@ VECTOR_SEARCH_TOP_K = 6
 LLM_HISTORY_LEN = 3
 
 <<<<<<< HEAD
+<<<<<<< HEAD
+=======
+>>>>>>> 7cc03c3 (feat: add api for knowledge_based QA)
 
 def load_file(filepath):
     if filepath.lower().endswith(".pdf"):
@@ -30,8 +33,11 @@ def load_file(filepath):
         docs = loader.load_and_split(text_splitter=textsplitter)
     return docs
 
+<<<<<<< HEAD
 =======
 >>>>>>> cba44ca (修复 webui.py 中 llm_history_len 和 vector_search_top_k 显示值与启动设置默认值不一致的问题)
+=======
+>>>>>>> 7cc03c3 (feat: add api for knowledge_based QA)
 
 class LocalDocQA:
     llm: object = None