* feat: Refactor astrbot builtin tool management
- Introduced a new registry for builtin tools to streamline their management.
- Added `SendMessageToUserTool`, `KnowledgeBaseQueryTool`, and various web search tools as builtin tools.
- Updated `FunctionToolManager` to cache and retrieve builtin tools efficiently.
- Modified `CronJobManager` to utilize the new `SendMessageToUserTool`.
- Enhanced the dashboard to display readonly status for builtin tools and prevent toggling their state.
- Added tests for builtin tool injection and retrieval to ensure proper functionality.
* fix: escape file path in shell command to prevent injection vulnerabilities
