为机器人对话补充了项目管理能力：可通过 项目、新建项目、绑定项目、解除项目 等命令（含英文别名）创建/绑定/解绑项目，使机器人会话也能使用事实黑板；当前 命令会显示绑定项目；帮助 按通用、对话、角色、项目分类，并改为 IM 友好的纯文本格式（【】、·）。后端仅改动 internal/handler/robot.go，设置页文档同步更新。
Robot chat now supports project management via commands such as 项目 / projects, 新建项目 / new project, 绑定项目 / bind project, and 解除项目 / unbind project, so bot conversations can create, bind, and unbind projects and use the shared fact board. The 当前 / current command also shows the bound project. Help text is grouped by category (General, Conversation, Role, Project) and uses plain-text formatting for IM clients. Backend changes are limited to internal/handler/robot.go; the settings page docs were updated accordingly.