[Feature]: use path for disk agent tool

[gusye1234]

Feature Description

current agent tool for disk follows the pattern of file_path + file_name, we should just replace it with path

Impact Component/Area

Which part of Acontext would this feature affect?

• Client SDK (Python)
• Client SDK (TypeScript)
• Core Service (Python)
• API Server (Go)
• UI/Dashboard (Next.js)
• CLI Tool
• Documentation
• Other (please specify)