Update recommender/graph_retrieval_vectordb.py

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Update recommender/retrieval_ranking.py

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Update recommender/graph_retrieval_vectordb.py

Update recommender/graph_retrieval_vectordb.py

Update recommender/graph_retrieval_vectordb.py

Update recommender/graph_retrieval_vectordb.py

Update recommender/retrieval_ranking.py

Update recommender/retrieval_ranking.py

Update recommender/retrieval_ranking.py

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Fix to handle user queries already having a credit card

Update recommender/graph_retrieval_vectordb.py

Update recommender/recommender.py

Fix graph db connection failed bug

Update recommender/retrieval_ranking.py

Update recommender/recommender.py

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Organize the code into directories