feat: 重构输入框为单输入框模式并添加震动反馈

- 将多输入框改为单个输入框，根据答案长度动态调整宽度
- 输入框 placeholder 显示答案字数提示
- 答案错误时触发微信小游戏震动反馈
- WxSDK 新增 vibrateShort/vibrateLong 方法
- 重构音效播放方法，提取公共 playSound 方法

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