[Inference Providers] deepinfra: add text-to-speech support (#4559)
Register DeepInfraTextToSpeechTask on the deepinfra provider, targeting the
OpenAI-compatible `POST /v1/openai/audio/speech` endpoint and returning the
raw audio bytes. The mapped provider model is applied last so caller
parameters cannot override it; `voice` is passed through untouched.
Co-authored-by: Oguz Vuruskaner <oguz@deepinfra.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: célina <hanouticelina@gmail.com>