* fix: voice setting for autoplayback TTS
* fix(useTextToSpeechExternal): resolve stateful playback issues and consolidate state logic
* refactor: initialize tts voice and provider schema once per request
* fix(tts): edge case, longer text inputs. TODO: use continuous stream for longer text inputs
* fix(tts): pause global audio on conversation change
* refactor: keyvMongo ban cache to allow db updates for unbanning, to prevent server restart
* chore: eslint fix
* refactor: make ban cache exclusively keyvMongo
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