APP_PORT=7860 LANGCHAIN_ENDPOINT="https://api.smith.langchain.com" LANGCHAIN_API_KEY="ls__..." LANGCHAIN_TRACING_V2="true" LANGCHAIN_PROJECT="streamlit_test" ANYSCALE_API_KEY="secret_..." OPENAI_API_KEY="sk-..." ANTHROPIC_API_KEY="sk-ant-..." DEFAULT_SYSTEM_PROMPT="You are a helpful chatbot." DEFAULT_MODEL="gpt-3.5-turbo" DEFAULT_TEMPERATURE=0.7 MIN_TEMPERATURE=0.0 MAX_TEMPERATURE=1.0 DEFAULT_MAX_TOKENS=1000 MIN_MAX_TOKENS=1 MAX_MAX_TOKENS=100000