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Add a `model` property to `ChatFireworks`, `ChatGroq`, and `ChatOpenRouter` that returns `model_name`. These partners use Pydantic's `Field(alias="model")` on `model_name`, which means `instance.model` doesn't work as a read accessor after construction — it raises an `AttributeError` or returns the field descriptor. `ChatOpenAI` already has this property; this brings the remaining in-repo partners to parity.