Function build_system_prompt 

pub fn build_system_prompt(
    bot_username: &str,
    caller_channel: &str,
    memory_context: &str,
    chat_id: i64,
    skills_catalog: &str,
    configured_timezone: &str,
    time_detail: SystemPromptTimeDetail,
    soul_content: Option<&str>,
    project_context: Option<&str>,
    user_model: Option<&str>,
) -> String