[WIP] Migrate EmbodiAgent to EmbodiChain

[Copilot]

Code Review Feedback Implementation Plan

• Remove unused imports from all files
  • embodichain/agents/hierarchy/agent_base.py
  • embodichain/agents/hierarchy/code_agent.py
  • embodichain/toolkits/code_generation.py
  • embodichain/agents/mllm/prompt/code_prompt.py
  • embodichain/toolkits/interfaces.py
  • embodichain/agents/hierarchy/task_agent.py
  • embodichain/agents/mllm/prompt/task_prompt.py
  • embodichain/toolkits/toolkits.py
• Remove unused variables in interfaces.py
• Fix import namespace pollution in agent_base.py
• Improve error handling
  • Add error handling for agent initialization
  • Add error handling for AST parsing in extract_drive_calls
  • Add error handling for LLM calls in validation_agent.py
  • Add error handling for drive() function
  • Add validation for base64 image decoding
• Address security concerns
  • Review exec() usage and AST injection
  • Remove hardcoded proxy settings in llm.py
• Clean up documentation mock environment variables
• Remove commented-out code

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