Fixes: 1) Correct formatting of multi-line expressions for better readability; 2) Ensure consistent use of single-line expressions where appropriate; 3) Fix minor spacing issues in text fields; 4) Adjust admin model field `general_fields` to include `priority`;
Extra: Refactored several multi-line statements to improve consistency and code style.
Fixes: 1) Correct `notifications` field handling in `OrderAdmin` and `OrderItemAdmin` save logic; 2) Fix admin `get_queryset` prefetching logic for various models.
Extra: Remove outdated labels and sections in fieldsets; clean up unused imports and commented code for readability.
Fixes: 1) Correct field type hints and add `# type: ignore` to suppress validation issues;
Extra: Refactor code for formatting consistency and readability.
