移除 CC BY-NC 猫叫录音和字节数据，换成原创 ZzFX 合成音；增加 viewport。 扩大开店按钮并在首次点击后恢复声音。
Removed the CC BY-NC meow recording and embedded bytes, replaced it with original ZzFX synthesis and added viewport metadata. Enlarged the start button and resume audio on first interaction.