refactor: implement pagination and enhance list rendering in ConditionBox component

- Removed the use of DynamicScroller in favor of a standard list for improved performance and simplicity.
- Added pagination functionality with current page and page size properties.
- Introduced computed properties for paginated list and total pages.
- Updated item addition and removal logic to handle pagination correctly.
- Enhanced the overall structure and readability of the ConditionBox component.

Author: cn-xufei