Replace isort with ruff for import sorting

- Update pre-commit config to use ruff with --select=I for imports only
- Apply ruff import sorting to fix pre-commit issues
- Ruff and black work together without conflicts

environments/community/router_env/engine/agents/calc_agent.py

@@ -2,13 +2,13 @@ import logging  # Added logging
 import os
 from typing import List, Optional  # Add Optional & List import
 
-from livekit.agents import mcp  # Corrected import for mcp
-from livekit.agents import tts  # Corrected import for tts module
 from livekit.agents import (  # Changed import; Add ChatContext import
     ChatContext,
     JobContext,
     WorkerOptions,
     cli,
+    mcp,  # Corrected import for mcp
+    tts,  # Corrected import for tts module
 )
 from livekit.agents.llm import (  # Added function_tool for delegate_to_router_agent if it were defined here
     ChatChunk,