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/tl.json

@@ -12,6 +12,7 @@
   "Logout": "Maglog out",
   "Login": "Magsimula ng sesyon",
   "Providers": "Mga Provider",
+  "Style": "Estilo",
   "Usage": "Mga Istatistika ng Paggamit",
   "API Key": "Susi ng API",
   "Connected": "Konektado",
@@ -176,6 +177,7 @@
   "How it works:": "Paano ito gumagana:",
   "Antigravity/Copilot IDE request → DNS redirect to localhost:443 → MITM proxy intercepts → 9Router → response to Antigravity/Copilot": "Antigravity/Copilot IDE request → DNS redirect sa localhost:443 → MITM proxy intercepts → 9Router → response sa Antigravity/Copilot",
   "No API keys — create one in Keys page": "Walang API keys — lumikha ng isa sa Keys page",
+  "e.g. a warm, gentle voice, speaking slowly with a British accent": "hal.: mainit at malumanay na boses, dahan-dahang nagsasalita nang may British accent",
   "sk_9router (default)": "sk_9router (default)",
   "Server started": "Ang server ay nagsimula",
   "Failed to start server": "Nabigo na magsimula ang server",