✨ feat: add Fast Animation in chat

[TheRamU]

💻 变更类型 | Change Type

• ✨ feat
• 🐛 fix
• ♻️ refactor
• 💄 style
• 👷 build
• ⚡️ perf
• 📝 docs
• 🔨 chore

🔀 变更说明 | Description of Change

• 新增快速动画

启用快速动画后，当模型响应速度较快时，将加速文本吐字的动画效果，从而避免模型已完成响应但动画仍在进行的情况。适合需要生成大段文本的场景。

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👍 @TheRamU

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