⏯️ fix(tts): Resolve Voice Selection and Manual Playback Issues (#2845)

* 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

api/server/services/start/assistants.js

@@ -1,6 +1,5 @@
 const {
   Capabilities,
-  EModelEndpoint,
   assistantEndpointSchema,
   defaultAssistantsVersion,
 } = require('librechat-data-provider');