语音合成（MiMo-TTS 系列）- OpenAI API 兼容

curl --location --request POST 'https://api.xiaomimimo.com/v1/chat/completions' \
--header "api-key: $MIMO_API_KEY" \
--header 'Content-Type: application/json' \
--data-raw '{
    "model": "mimo-v2.5-tts",
    "messages": [
        {
            "role": "user",
            "content": "Bright, bouncy, slightly sing-song tone — like you are bursting with good news you can barely hold in. Fast pace, rising pitch at the end."
        },
        {
            "role": "assistant",
            "content": "Hey boss — guess what, guess what? I just got the results back and I actually passed! Not just passed, I got a distinction! I know, I know — you told me I was cutting it close, but hey, here we are. Drinks are on me tonight, okay?"
        }
    ],
    "audio": {
        "format": "wav",
        "voice": "mimo_default"
    }
}'

{
    "id": "6ebed286b58546f6b87fa7fa9d0e806b",
    "choices": [
        {
            "finish_reason": "stop",
            "index": 0,
            "message": {
                "content": "",
                "role": "assistant",
                "audio": {
                    "id": "979a91904f9a4143928d9e1f54837b4f",
                    "data": "base64Data",
                    "expires_at": null,
                    "transcript": null
                },
                "tool_calls": null
            }
        }
    ],
    "created": 1776954802,
    "model": "mimo-v2.5-tts",
    "object": "chat.completion",
    "usage": {
        "completion_tokens": 97,
        "prompt_tokens": 213,
        "total_tokens": 310,
        "completion_tokens_details": {
            "reasoning_tokens": 0
        },
        "prompt_tokens_details": {
            "cached_tokens": 109
        }
    }
}