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重构 Agent：引入 LangGraph StateGraph 替代手写 FC 循环

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架构变更：
- 新增 app/services/agent/ 模块（state/prompts/graph/tools）
- 7 个工具从 _tool_xxx 方法提取为 @tool 装饰器函数
- 构建 assistant + ToolNode 的 ReAct 图
- agent_dispatcher.py 改为薄壳入口，支持 USE_LANGGRAPH 开关
- MemorySaver checkpoint 持久化对话（thread_id=wechat-{user_id}）
- 新增依赖：langchain-core, langchain-openai, langgraph

向后兼容：
- USE_LANGGRAPH=false 可切回旧版 FC 循环
- LangGraph 初始化失败自动降级到 Legacy 模式
- 企微图片处理/VLM分析逻辑不变
This commit is contained in:
16337
2026-03-25 13:52:55 +08:00
parent d1aa14bb23
commit 8156f54004
11 changed files with 809 additions and 668 deletions
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app/services/agent/__init__.py Normal file
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"""
LangGraph Agent 模块
基于 LangGraph StateGraph 的企微交互 Agent，替代手写 FC 循环。
"""