fix: add missing PathBuf import

src/core/bot/tool_executor.rs

@@ -5,7 +5,7 @@ use serde_json::Value;
 // use std::collections::HashMap;
 use std::fs::OpenOptions;
 use std::io::Write;
-use std::path::Path;
+use std::path::{Path, PathBuf};
 use std::sync::Arc;
 use uuid::Uuid;