Refactor scheduled task repository and schemas for improved type hints and consistency

- Updated type hints from List/Optional to list/None for better readability and consistency across the codebase.
- Refactored import statements for better organization and clarity.
- Enhanced the ScheduledTaskBase schema to use modern type hints.
- Cleaned up unnecessary comments and whitespace in various files.
- Improved error handling and logging in task execution handlers.
- Updated test cases to reflect changes in type hints and ensure compatibility with the new structure.

test_task.py

@@ -5,15 +5,16 @@ import asyncio
 from datetime import datetime
 
 from app.core.database import get_session_factory
+from app.models.scheduled_task import RecurrenceType, TaskType
 from app.repositories.scheduled_task import ScheduledTaskRepository
-from app.models.scheduled_task import TaskType, RecurrenceType
+
 
 async def create_test_task():
     session_factory = get_session_factory()
-    
+
     async with session_factory() as session:
         repo = ScheduledTaskRepository(session)
-        
+
         task_data = {
             "name": "Live Test Task",
             "task_type": TaskType.PLAY_SOUND,
@@ -23,9 +24,9 @@ async def create_test_task():
             "user_id": 1,
             "recurrence_type": RecurrenceType.NONE,
         }
-        
+
         task = await repo.create(task_data)
         print(f"Created task: {task.name} (ID: {task.id}) scheduled for {task.scheduled_at}")
 
 if __name__ == "__main__":
-    asyncio.run(create_test_task())
+    asyncio.run(create_test_task())