Changes to Build a Roark-hosted agent

added the new optional request property llm

added the new optional request property stt

added the new optional request property tts/model

added the non-success response with the status 403

request property tts/provider was restricted to a list of enum values

added the new CARTESIA enum value to the request property tts/provider

added the new ELEVENLABS enum value to the request property tts/provider

added the new OPENAI enum value to the request property tts/provider

added the new RIME enum value to the request property tts/provider

the tts/provider request property's minLength was decreased from 1 to 0

added the new optional request property tts

endpoint added