refactor: 升级vite至v6版本，升级sass至最新版，重构主题写法，弃用@pureadmin/theme
#1968
| Job | Run time |
|---|---|
| 1m 27s | |
| 1m 27s |
vite至v6版本，升级sass至最新版，重构主题写法，弃用@pureadmin/theme
#1968
| Job | Run time |
|---|---|
| 1m 27s | |
| 1m 27s |