Feature request: list structured output support on openrouter.ai/api/v1/models

I just added schema support to my CLI tool for accessing models:

- https://github.com/simonw/llm-openrouter/issues/23

I don't have a good way to tell _which_ models support schemas programmatically, so I had to warn people in the README that some models might not work: https://github.com/simonw/llm-openrouter/blob/0.4/README.md#schemas

If this API endpoint https://openrouter.ai/api/v1/models included an indication as to if the model supports structured output support or not I could use that information in my own tool.

It currently looks like this:

```json
    {
      "id": "google/gemini-2.0-flash-lite-001",
      "name": "Google: Gemini 2.0 Flash Lite",
      "created": 1740506212,
      "description": "Gemini 2.0 Flash Lite offers a significantly faster time to first token (TTFT) compared to [Gemini Flash 1.5](/google/gemini-flash-1.5), while maintaining quality on par with larger models like [Gemini Pro 1.5](/google/gemini-pro-1.5), all at extremely economical token prices.",
      "context_length": 1048576,
      "architecture": {
        "modality": "text+image->text",
        "tokenizer": "Gemini",
        "instruct_type": null
      },
      "pricing": {
        "prompt": "0.000000075",
        "completion": "0.0000003",
        "image": "0",
        "request": "0",
        "input_cache_read": "0",
        "input_cache_write": "0",
        "web_search": "0",
        "internal_reasoning": "0"
      },
      "top_provider": {
        "context_length": 1048576,
        "max_completion_tokens": 8192,
        "is_moderated": false
      },
      "per_request_limits": null
    }
```

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Feature request: list structured output support on openrouter.ai/api/v1/models #20

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Feature request: list structured output support on openrouter.ai/api/v1/models #20

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