Fixes: 1) Add missing imports for `FieldListFilter` and `reverse` in `core/admin.py`;
Extra: 1) Include relevant JS and CSS assets for autocomplete functionality; 2) Add comments and structure for better readability in template and script.
Fixes: 1) Remove unnecessary imports related to the deleted functionality.
Extra: 1) Extensive cleanup to remove redundant code and references; 2) Minor formatting adjustments for improved readability.
Fixes: 1) Remove unused imports from `core/admin.py`;
Extra: 1) Delete redundant `autocomplete_filter.html` template and associated filter classes for cleanup; 2) Minor refactoring of `ProductAdmin` class in alignment with the removal of filters.
Fixes: 1) Correct `parameter_name` assignments in BrandAdminFilter, CategoryAdminFilter, TagsAdminFilter, and VendorAdminFilter to use plain strings;
Extra: None;
