refactor: move estado da sessão para o domínio

src/voice_assistant/audio_gateway/app/main.py

@@ -99,7 +99,7 @@ from voice_assistant.voice_pipeline import (
 )
 
 
-from voice_assistant.audio_gateway.app.session import SessionState
+from voice_assistant.domain.session import SessionState
 
 # logger configuration
 logger = logging.getLogger(__name__)