新增 fastapi 接口

[linyqh]

🚀 New FastAPI Interfaces Added to the TTS Server!

We’ve just upgraded our TTS server with FastAPI support, making it more flexible and user-friendly. Here are the new features:

• 🗂️ Get Model List: Easily browse through all available voice models.
• 📥 Load Model: Quickly load any voice model on demand.
• 🎙️ Text-to-Speech: Convert text into natural-sounding speech with just a few clicks.
• 🧬 Voice Cloning: Clone a voice and generate speech with personalized tones.

[CLAassistant]

All committers have signed the CLA.

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