Add Celery Beat schedule files to .gitignore and remove from tracking

These files are automatically generated by Celery Beat and should not be
version controlled. They contain runtime schedule state and are specific
to each environment.

Files removed from tracking:
- celerybeat-schedule
- celerybeat-schedule-shm
- celerybeat-schedule-wal

Added to .gitignore to prevent future accidental commits.

myproject/.gitignore

@@ -63,6 +63,11 @@ htmlcov/
 # */migrations/*.py
 # !*/migrations/__init__.py
 
+# Celery Beat schedule database (автоматически создаётся при запуске celery beat)
+celerybeat-schedule
+celerybeat-schedule-shm
+celerybeat-schedule-wal
+
 # Documentation files in root (сгенерированные документы)
 /CELERY_SETUP_GUIDE.md
 /FINAL_REPORT.md