ModelPricing schema

Field	Type and description
`unit` Required	string Pricing unit (e.g. 1M Tokens, Image, Second, Dynamic Image).
`currency` Required	string Settlement currency code. Allowed values: `["DZD"]`
`input` Required	number Cost per unit for input tokens, image, second, or base multiplier.
`output`	number Cost per unit for output tokens (if applicable).
`formula`	string Dynamic sizing formula for dynamic image generation (if applicable).