为 DSH 添加 Xiaomi MiMo TTS、豆包 Seed TTS，浏览器语音；音频下载、 UI 音效、桌宠联动、QQBot 语音；

Text-to-speech for DeepSeek Harness: speak agent replies in the Web UI with a provider fallback chain (OpenAI, ElevenLabs, Google, Azure, Groq, Deepgram, OpenRouter, Edge, Piper, eSpeak).