feat(tts): add Xiaomi MiMo text-to-speech support

Adds mimo-v2.5-tts as a Media Provider TTS through the existing
OpenAI-compatible chat-completions endpoint. Voice is selected via the
top-level audio.voice field, and an optional style/language hint is
threaded through tts.js -> ttsCore.js -> the new adapter.

public/i18n/literals/fa.json

@@ -1119,6 +1119,7 @@
   "Stop Server": "توقف سرور",
   "Stopped": "متوقف شد",
   "Strict Proxy": "پروکسی سختگیرانه",
+  "Style": "سبک",
   "Subagent Model": "مدل زیرعامل",
   "Sudo Password Required": "رمز عبور sudo الزامی است",
   "Sudo password is required": "رمز عبور sudo الزامی است",
@@ -1312,6 +1313,7 @@
   "disabled": "غیرفعال",
   "dollars per million tokens": "دلار به ازای هر میلیون توکن",
   "e.g. CwhRBWXzGAHq8TQ4Fs17": "مثلاً CwhRBWXzGAHq8TQ4Fs17",
+  "e.g. a warm, gentle voice, speaking slowly with a British accent": "مثلاً: صدای گرم و ملایم که با لهجه بریتانیایی به‌آرامی صحبت می‌کند",
   "e.g. claude-opus-4-5": "مثلاً claude-opus-4-5",
   "e.g. my-model-id": "مثلاً my-model-id",
   "e.g. tts-1-hd": "مثلاً tts-1-hd",