feat: 1. replace black with ruff for fomatting and sort import (#489)

2. use tavily from`langchain-tavily` rather than the older one from `langchain-community`

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

src/prompts/template.py

@@ -1,11 +1,13 @@
 # Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
 # SPDX-License-Identifier: MIT
 
-import os
 import dataclasses
+import os
 from datetime import datetime
+
 from jinja2 import Environment, FileSystemLoader, select_autoescape
 from langgraph.prebuilt.chat_agent_executor import AgentState
+
 from src.config.configuration import Configuration
 
 # Initialize Jinja2 environment