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.

open-sse/providers/registry/xiaomi-mimo.js

@@ -15,10 +15,11 @@ export default {
     textIcon: "XM",
     website: "https://xiaomimimo.com",
     notice: {
-      apiKeyUrl: "https://xiaomimimo.com",
+      apiKeyUrl: "https://platform.xiaomimimo.com/console/api-keys",
     },
   },
   category: "apikey",
+  serviceKinds: ["llm", "tts"],
   transport: {
     baseUrl: "https://api.xiaomimimo.com/v1/chat/completions",
     validateUrl: "https://api.xiaomimimo.com/v1/models",
@@ -42,5 +43,12 @@ export default {
     { id: "mimo-v2.5", name: "MiMo V2.5" },
     { id: "mimo-v2-omni", name: "MiMo V2 Omni" },
     { id: "mimo-v2-flash", name: "MiMo V2 Flash" },
+    { id: "mimo-v2.5-tts", name: "MiMo V2.5 TTS", kind: "tts" },
   ],
+  ttsConfig: {
+    baseUrl: "https://api.xiaomimimo.com/v1/chat/completions",
+    authType: "apikey",
+    authHeader: "bearer",
+    format: "xiaomi-mimo-tts",
+  },
 };