List available models with pricing and capabilities

curl --request GET \
  --url https://api-sandbox.featherhq.com/v1/model-router/models \
  --header 'x-api-key: <api-key>'

[
  {
    "model_identifier": "<string>",
    "provider": "<string>",
    "supports_streaming": true,
    "max_context_window": 123,
    "input_price_per_1m": 123,
    "output_price_per_1m": 123,
    "supports_tools": true,
    "supports_vision": false,
    "regions": [
      "<string>"
    ],
    "family": "default",
    "supports_json_schema": true,
    "supports_reasoning_effort": false,
    "supports_temperature": true,
    "supports_thinking": false,
    "supports_audio": false,
    "compliance_tags": [
      "<string>"
    ]
  }
]