fix: separate report stream from question stream, harden abort detection, production dockerfile

fix: gen report with stream, user_end check

feat: logger and docker

fix: del stream_db

feat: stream

feat: user ended

feat: check_sub_node

feat: lang check & aborted

refactor: replace flat functions with LangGraph StateGraph

fix: evaluation json format, del graph

fix: errors and bugs

feat: add basic codes