offloaded some apps.lyric.views responsibilities to new Celery depend fn in .tasks; core.celery created for celery config; CELERY_BROKER_URL added to .settings & throughout project; some lyric view IT responsibility now accordingly covered by task UT domain

src/core/settings.py

@@ -109,6 +109,8 @@ else:
         }
     }
 
+# Celery
+CELERY_BROKER_URL = os.environ.get('CELERY_BROKER_URL', 'redis://localhost:6379/0')
 
 # Password validation
 # https://docs.djangoproject.com/en/6.0/ref/settings/#auth-password-validators