Changes to endpoints so they allow to only get context and then the exercises as well as tidying up a bit

app/services/impl/exam/speaking.py

@@ -9,7 +9,7 @@ from app.repositories.abc import IFileStorage, IDocumentStore
 from app.services.abc import ISpeakingService, ILLMService, IVideoGeneratorService, ISpeechToTextService
 from app.configs.constants import (
     FieldsAndExercises, GPTModels, TemperatureSettings,
-    AvatarEnum, FilePaths
+    ELAIAvatars, FilePaths
 )
 from app.helpers import TextHelper
 
@@ -425,7 +425,7 @@ class SpeakingService(ISpeakingService):
         self._logger.info(f'Saved speaking to DB with id {req_id} : {str(template)}')
 
     async def _create_video_per_part(self, exercises: List[Dict], template: Dict, part: int):
-        avatar = (random.choice(list(AvatarEnum))).value
+        avatar = (random.choice(list(ELAIAvatars))).name
         template_index = part - 1
 
         # Using list comprehension to find the element with the desired value in the 'type' field