Feat：新增支持undo/fork 功能#728
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后端:
- 新增 thread_undo_service: FOR UPDATE 防竞态 + 递归 CTE + channel/version 精确 blob 归档
- 新增 thread_fork_service: Phase1 物理克隆 + Phase2 数据库事务，DISTINCT 防 blob 主键冲突
- 新增 checkpoint_tables: LangGraph checkpoint 表反射定义（table() Core 风格）
- 新增 checkpoint_repository: 递归 CTE 构建器 + select 构建器
- chat_router: POST /thread/{id}/undo + /fork 路由
- manager: checkpoint 递归 CTE 性能索引
前端:
- AgentMessageComponent: 消息气泡 hover 显示 Undo/Fork 按钮
- AgentChatComponent: handleUndo / handleFork 事件处理
- agent_api: undoThread / forkThread API 调用
测试: 13 个单元测试覆盖入口校验全场景
原代码用 AgentRun.extra_metadata 做 jsonb_set，但 AgentRun 模型没有 extra_metadata 列，导致 AttributeError。改为用 error_message 字段 记录 'cancelled_by_user_undo'。
将 agent_runs 取消逻辑从 SQL 子查询改为 Python 侧提取： 先加载待删除消息 → 提取 request_id 列表 → 再用 IN 条件更新 AgentRun。 同时调整步骤顺序：先标记消息删除(10)，再取消 agent_runs(11)。
Undo 后前端重新加载消息历史，但原 API 不过滤 is_deleted 消息， 用户仍能看到已删除消息并重复触发 undo（422 报错）。 在 get_thread_history_view 中跳过 is_deleted==true 的消息。
参数名 message 遮蔽了 ant-design-vue 的 message API， 导致 message.success() 报 undefined。改为 msg。
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变更描述
简要描述这个 PR 做了什么
基于pg checkpoint支持新增支持undo/fork 功能
实现 Undo/Fork 时间旅行功能（对话回退与分叉）
后端:
前端:
测试: 13 个单元测试覆盖入口校验全场景
变更类型
测试
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make lint和make format检查代码规范