#### What type of PR is this?
/kind feature
/area core
/area theme
/milestone 2.16.x
#### What this PR does / why we need it:
为主题管理增加在线清理缓存功能
#### Which issue(s) this PR fixes:
Fixes#5440
#### Does this PR introduce a user-facing change?
```release-note
为主题管理增加在线清理缓存功能
```
#### What type of PR is this?
/area core
/area ui
/kind feature
/kind api-change
#### What this PR does / why we need it:
为主题和插件的定义文件添加 issues 字段，用于填写问题反馈地址。方便使用者可以清楚的知道可以在哪里反馈问题。
<img width="767" alt="image" src="https://github.com/halo-dev/halo/assets/21301288/b7dfce3f-8362-4964-82b8-cc018b85bb82">
#### Which issue(s) this PR fixes:
Fixes#5715
#### Does this PR introduce a user-facing change?
```release-note
为主题和插件的定义文件添加问题反馈（issues）字段
```
#### What type of PR is this?
/area ui
/kind bug
/milestone 2.14.x
#### What this PR does / why we need it:
重构文章预览和主题预览的页面加载方式，尝试解决在某些情况下打开预览导致登录 session 失效的问题。
#### Which issue(s) this PR fixes:
Fixes https://github.com/halo-dev/halo/issues/4047
#### Special notes for your reviewer:
需要测试：
1. 主题预览中的各个功能是否正常。
2. 文章预览功能是否正常。
#### Does this PR introduce a user-facing change?
```release-note
修复在某些情况下，打开文章预览或主题预览之后导致登录失效的问题。
```
guqing