refactor the coding workspace && support larger code refactoring request

add go-to-production code

polish the workspace logicic

make some progresses in the workspace

use litellm underlying

include stt integration test

poc proven for stt

add support of streaming TTS

add db path support in yaml config

refactor code

add dspy

Refactor core structure and add new RAG modules

Add database and model to the project

first commit