busy loop cpu 100%

[wangxuanyue]

run ./usql_static

ENV : Linux 5.10.0-46.32.uelc20.x86_64

The problem reason given by AI:
This is a known issue, typically occurring in specific environments (especially during static builds), causing the readline library to stop blocking while waiting for input and instead continuously return empty results, which leads the main loop into a busy loop that consumes 100% CPU.

<<<<
        case cmd != "":
            opt, cont, lastErr = h.apply(stdout, stderr, strings.TrimPrefix(cmd, `\`), paramstr)
        }
====
        case cmd != "":
            opt, cont, lastErr = h.apply(stdout, stderr, strings.TrimPrefix(cmd, `\`), paramstr)
        default:
            if iactive {
                time.Sleep(time.Millisecond)
            }
        }
>>>>