#### What type of PR is this?
/area ui
/kind improvement
/milestone 2.20.x
#### What this PR does / why we need it:
统一空状态界面中操作按钮的风格。
#### Does this PR introduce a user-facing change?
```release-note
统一空状态界面中操作按钮的风格。
```
#### What type of PR is this?
/area ui
/kind improvement
/milestone 2.19.x
#### What this PR does / why we need it:
使用 patch 接口重构菜单项拖动排序等功能。
#### Which issue(s) this PR fixes:
None
#### Special notes for your reviewer:
需要测试菜单项的拖动排序功能是否符合预期。
#### Does this PR introduce a user-facing change?
```release-note
使用 patch 接口重构菜单项拖动排序功能。
```
#### What type of PR is this?
/area ui
/kind improvement
/milestone 2.17.x
#### What this PR does / why we need it:
添加对菜单的限制，不能删除已经设置为主菜单的菜单。
#### Which issue(s) this PR fixes:
Fixes https://github.com/halo-dev/halo/issues/4956
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/area ui
/kind improvement
/milestone 2.17.x
#### What this PR does / why we need it:
重新组织和固定 UI 部分代码的 imports 导入，防止后续因为 imports 的顺序造成不必要的 diff。
基于：https://github.com/halo-dev/halo/pull/6151
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/area ui
/kind bug
/milestone 2.16.x
#### What this PR does / why we need it:
修复部分表单数据更新时，引用的初始值对象被跟着更新的问题。
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/area ui
/kind cleanup
/milestone 2.16.x
#### What this PR does / why we need it:
规范 api client 的方法名，之前生成的 api client 的方法名没有完全遵循驼峰命名。
#### Which issue(s) this PR fixes:
Close https://github.com/halo-dev/halo/issues/5716
#### Special notes for your reviewer:
CI 通过即可。
#### Does this PR introduce a user-facing change?
```release-note
None
```
#### What type of PR is this?
/area ui
/kind improvement
/milestone 2.16.x
#### What this PR does / why we need it:
优化菜单管理相关的 UI 代码。
1. 使用 vue-draggable-plus 库代替 vuedraggable 库实现拖拽排序。vue-draggable-plus 是在 https://github.com/halo-dev/halo/pull/5914 中引入，替换的原因是 vuedraggable 库已经不再积极维护。
2. 改进菜单和菜单项编辑表单的逻辑，清理无用代码。
#### Special notes for your reviewer:
需要测试：
1. 测试菜单项拖拽排序功能是否表现正常。
2. 测试新增菜单、菜单项和修改菜单、菜单项功能是否表现正常。
#### Does this PR introduce a user-facing change?
```release-note
None
```
John Niang