開口說功能實驗

@Jim-0102

如果之後使用者除了點擊選擇，還要可以用語音輸入以練習口說的話，應該會很實用
就會需要串後端的AI語音辨識服務，等到你想要試做那一步時，再告訴我，我再開CloudFlare後台的權限給你。

參考：

[自主學英文-開口說](https://en.alearn.org.tw/fav/speakout)
[https://developers.cloudflare.com/workers-ai/models/whisper-large-v3-turbo/](https://developers.cloudflare.com/workers-ai/models/whisper-large-v3-turbo/)

The issue describes adding voice input for speaking practice, integrating with Cloudflare Workers AI for speech recognition (Whisper model). Start by examining the existing Vue 3 frontend for input methods, then explore Cloudflare Workers AI documentation for the Whisper-large-v3-turbo model. 'Done' means a user can record speech and get a transcription via the backend service.

Vom Indexierungsmodell aus dem Issue-Text verfasst.