* 🔧 fix: TTS and STT Services to use AppConfig
- Updated `getProviderSchema` and `getProvider` methods to accept an optional `appConfig` parameter, allowing for more flexible configuration retrieval.
- Improved error handling by ensuring that the app configuration is checked before accessing TTS and STT schemas.
- Refactored `processTextToSpeech` and `streamAudio` methods to utilize the new `appConfig` parameter for better clarity and maintainability.
* feat: Cumulative Transcription Support for STT External
* style: fix medium-sized styling for admin settings dialogs
