chore: 添加子域名托管解析设置并更新相关提示

- 在证书申请页面添加子域名托管解析设置入口
- 更新域名输入提示，增加子域名托管解析相关说明
- 更改子域名托管解析页面图标

packages/ui/certd-client/src/router/source/modules/certd.ts

@@ -104,7 +104,7 @@ export const certdResources = [
             path: "/certd/pipeline/subDomain",
             component: "/certd/pipeline/sub-domain/index.vue",
             meta: {
-              icon: "ion:link-outline",
+              icon: "material-symbols:approval-delegation-outline",
               auth: true,
               keepAlive: true,
             },