Function aria_complete 

#[unsafe(no_mangle)]
pub extern "C" fn aria_complete(
    model: *mut AriaModel,
    messages_json: *const i8,
    options_json: *const i8,
    tools_json: *const i8,
    out: *mut i8,
    out_len: usize,
) -> i32

Non-streaming chat completion. tools_json may be null.