phsl / admin

- 根据"DRY"(Don't Repeat Yourself)原则，使用动态年份代替硬编码，确保年份始终保持最新
- Introduced a new computed property `currentYear` in `Footer.vue` to dynamically display the current year in the copyright notice.
- Updated the copyright span to use `currentYear` instead of a hardcoded year, enhancing maintainability and accuracy.