Go: implement ASR and TTS for xiaomi (#15765)

### What problem does this PR solve?

**Verified from CLI**
```
RAGFlow(user)> chat with 'mimo-v2.5@test@xiaomi' message 'who r u'
Answer: Hello! I'm MiMo-v2.5, a large language model developed by Xiaomi's LLM Core Team. You can think of me as a friendly AI assistant ready to help you answer questions, have conversations, or work on creative tasks. My context window can handle up to 1 million tokens, so we can dive into pretty long discussions or documents if you'd like. What can I help you with today?
Time: 3.831830

RAGFlow(user)> stream chat with 'mimo-v2.5@test@xiaomi' message 'who r u'
Answer:  there! I'm MiMo-v2.5, an AI assistant created by the Xiaomi LLM Core Team. I'm here to chat, help out, answer questions, or just have a friendly conversation. Think of me as a helpful buddy with a pretty big memory (1 million tokens worth!). What can I do for you today?😊
Time: 2.421630

RAGFlow(user)> think chat with 'mimo-v2.5@test@xiaomi' message 'who r u'
Thinking: The user is asking a simple question about who I am. According to my system prompt, I should:
- Identify myself as **MiMo-v2.5**
- State that I was developed by the **Xiaomi LLM Core Team**
- Answer in first person and be warm and conversational
Answer: Hey there! 👋

I'm **MiMo**, an AI assistant created by the **Xiaomi LLM Core Team**. Think of me as a friendly chat buddy who's here to help you with all sorts of questions and tasks!

I love having conversations, answering questions, brainstorming ideas, and helping people figure things out. Whether you want to chat, need help with something specific, or just want to explore ideas together — I'm here for it! 😊

What can I help you with today?
Time: 6.651589

RAGFlow(user)> tts with 'mimo-v2.5-tts@test@xiaomi' text 'hello? show yourself' play format 'wav' param '{"voice": "Chloe"}'
SUCCESS

RAGFlow(user)> asr with 'mimo-v2.5-asr@test@xiaomi' audio './internal/test.wav' param '{"language": "zh"}'
+------------------------------------------------------------------------------------------------------------------------+
| text                                                                                                                   |
+------------------------------------------------------------------------------------------------------------------------+
| 1 The examination and testimony of the experts enabled the commission to conclude that five shots may have been fired. |
+------------------------------------------------------------------------------------------------------------------------+
```

### Type of change

- [x] New Feature (non-breaking change which adds functionality)
- [x] Refactoring

conf/models/xiaomi.json

@@ -1,12 +1,11 @@
 {
   "name": "Xiaomi",
   "url": {
-    "default": "https://api.xiaomimimo.com"
+    "default": "https://api.xiaomimimo.com/v1"
   },
   "url_suffix": {
-    "chat": "v1/chat/completions"
+    "chat": "chat/completions"
   },
-  "class": "xiaomi",
   "models": [
     {
       "name": "mimo-v2.5-pro",
@@ -19,15 +18,26 @@
       "name": "mimo-v2.5",
       "max_tokens": 1048576,
       "model_types": [
-        "chat",
-        "vision"
+        "chat"
       ]
     },
     {
-      "name": "mimo-v2-flash",
-      "max_tokens": 262144,
+      "name": "mimo-v2.5-asr",
+      "max_tokens": 8192,
       "model_types": [
-        "chat"
+        "asr"
+      ]
+    },
+    {
+      "name": "mimo-v2.5-tts",
+      "model_types": [
+        "tts"
+      ]
+    },
+    {
+      "name": "mimo-v2-tts",
+      "model_types": [
+        "tts"
       ]
     }
   ]