feat: integrate ModelVerse AI Platform (OpenAI-compatible)

MODELVERSE.md

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+# ModelVerse Integration for speech-to-speech
+
+[ModelVerse](https://modelverse.cn) is an AI model aggregation platform fully compatible
+with the OpenAI API format. You can access DeepSeek, GPT-4, Claude and more models
+through a single unified endpoint.
+
+## Quick Start
+
+**Step 1**: Get your API key from [ModelVerse Platform](https://modelverse.cn)
+
+**Step 2**: Install the OpenAI SDK (if not already installed)
+
+```bash
+pip install openai
+```
+
+**Step 3**: Use ModelVerse in this project
+
+```python
+from openai import OpenAI
+
+client = OpenAI(
+    api_key="your-modelverse-api-key",
+    base_url="https://api.modelverse.cn/v1",
+)
+
+response = client.chat.completions.create(
+    model="deepseek-ai/DeepSeek-V3",
+    messages=[{"role": "user", "content": "Hello!"}],
+)
+print(response.choices[0].message.content)
+```
+
+## Available Models
+
+| Model | Description |
+|-------|-------------|
+| `deepseek-ai/DeepSeek-V3` | High performance, cost-effective |
+| `gpt-4o` | OpenAI GPT-4o |
+| `claude-opus-4-6` | Anthropic Claude |
+
+## Why ModelVerse?
+
+- One API key, access 100+ models
+- OpenAI-compatible, zero code changes needed
+- Competitive pricing
+
+> Auto-generated by [ModelVerse GitHub Agent](https://modelverse.cn)