Method countdown

src/ui/components/Progress.ts:114–131

* 倒计时

(seconds: number, message: string = '倒计时')

   * 倒计时
   */
  public static countdown(seconds: number, message: string = '倒计时'): Promise<void> {
    return new Promise(resolve => {
      let remaining = seconds;

      const timer = setInterval(() => {
        process.stdout.write(`\r${message}: ${UIStyles.status.warning(remaining.toString())}s `);

        remaining--;

        if (remaining < 0) {
          clearInterval(timer);
          process.stdout.write('\r');
          UIDisplay.success('倒计时完成！');
          resolve();
        }
      }, 1000);
    });
  }

  /**
   * 模拟加载过程