Function handle_direct 

pub async fn handle_direct(
    prompt: String,
    provider: Option<String>,
    model: Option<String>,
    system_prompt: Option<String>,
    max_tokens: Option<String>,
    temperature: Option<String>,
    _attachments: Vec<String>,
    _images: Vec<String>,
    _audio_files: Vec<String>,
    tools: Option<String>,
    _vectordb: Option<String>,
    use_search: Option<String>,
    stream: bool,
) -> Result<()>

Handle direct prompt command