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/id.json

@@ -12,6 +12,7 @@
   "Logout": "Keluar",
   "Login": "Masuk",
   "Providers": "Penyedia",
+  "Style": "Gaya",
   "Usage": "Statistik Penggunaan",
   "API Key": "Kunci API",
   "Connected": "Terhubung",
@@ -176,6 +177,7 @@
   "How it works:": "Cara kerjanya:",
   "Antigravity/Copilot IDE request → DNS redirect to localhost:443 → MITM proxy intercepts → 9Router → response to Antigravity/Copilot": "Permintaan Antigravity/Copilot IDE → Pengalihan DNS ke localhost:443 → Proxy MITM mengintersep → 9Router → respons ke Antigravity/Copilot",
   "No API keys — create one in Keys page": "Tidak ada kunci API — buat satu di halaman Keys",
+  "e.g. a warm, gentle voice, speaking slowly with a British accent": "mis.: suara hangat dan lembut, berbicara pelan dengan aksen Inggris",
   "sk_9router (default)": "sk_9router (bawaan)",
   "Server started": "Server dimulai",
   "Failed to start server": "Gagal memulai server",