fix(api): correct import paths in memory_read and celery task command

- Fix relative imports in memory_read.py to use absolute app paths
- Change celery scheduler command from `python app/celery_task_scheduler.py` to `python -m app.celery_task_scheduler`

api/docker-compose.yml

@@ -70,7 +70,7 @@ services:
       - .env
     volumes:
       - /etc/localtime:/etc/localtime:ro
-    command: python app/celery_task_scheduler.py
+    command: python -m app.celery_task_scheduler
     restart: unless-stopped
     healthcheck:
       test:  CMD curl -f 127.0.0.1:8001 || exit 1