added langchain app for simplicity

langchainapp.py

@@ -23,11 +23,8 @@ from utils import load_env_variables, parse_and_route , escape_special_character
 from globalvars import API_BASE, intention_prompt, tasks, system_message, model_name , metadata_prompt 
 # import time  
 # import httpx  
-from langchain_community.document_loaders import PyPDFLoader
-from langchain.text_splitter import RecursiveCharacterTextSplitter
-from langchain.embeddings import HuggingFaceEmbeddings
-from langchain.chat_models import ChatOpenAI
 
+from langchain_community.chat_models import ChatOpenAI
 from langchain.retrievers.document_compressors import LLMChainExtractor
 from langchain.retrievers.multi_query import MultiQueryRetriever
 from langchain.retrievers import ContextualCompressionRetriever