Function run_search 

async fn run_search<C2S, F, Fut>(
    server: &FutuServer,
    tool_name: &'static str,
    label: &'static str,
    req: ProtoJsonReq,
    req_ctx: RequestContext<RoleServer>,
    handler: F,
) -> Result<String, String>
where
    C2S: DeserializeOwned,
    F: FnOnce(Arc<FutuClient>, C2S) -> Fut,
    Fut: Future<Output = Result<String>>,