fix typo

include stt integration test

refactor the routes api to be more modularized

add tts support from user end

refactor the integration test but tts is broken

add toggle on client side to enable or disable faiss db retriever

support switch model in between

support chat history

introduce the session into the frontend api

introduce the delete document funcs

introduce chain of throught

add dspy

Refactor the code structure to allow using both gemini and Deepseek.

first commit