Tinfoil's catalog lists voxtral-tts at $0/$0, so the entry declared no cost at
all and speech usage never consumed member allowance — voice mode was free
against the member budget while every other capability was metered. The OWUI
precedent was to bill TTS like anything else, so set the field.
input_cost_per_character: 0.000016 = $16/1M characters, from LiteLLM's bundled
map for the same weights (mistral/voxtral-mini-tts-*, sourced to Mistral's model
card) and the field OpenAI's TTS entries use on this adapter.
Revisit if the Tinfoil invoice shows a different number, and note the policy
question: Tinfoil may be serving this model beta-free, so members would be
consuming allowance for a resource the co-op is not paying for.
