feat(avatar): 顶栏三态头像接入（YschTheme 默认头像轮 sync 件）

- src/utils/avatar.ts + src/components/UserAvatar.vue：YschTheme sync 下发公共源（取值链 URL > yh-avatar > yh-avatar-sch-default > text，值域 text|silhouette）
- layout.vue：顶栏 img 头像换 UserAvatar 组件（placement=brand，size=28）；头像/姓名点击统一跳 UserHome 设置页「个人信息」pane（原 /v/userinfo 已下线语义）

src/components/layout.vue

@@ -5,6 +5,7 @@ import { useRoute, useRouter } from "vue-router";
 import { Message } from "view-ui-plus";
 import useCurrentInstance from "@/utils/hook/useCurrentInstance";
 import SvgIcon from "@/components/SvgIcon.vue";
+import UserAvatar from "@/components/UserAvatar.vue";
 let props = defineProps<{ layoutData: LayoutData }>();
 const reload: Function = inject("reload") || new Function("console.error('empty')");
 
@@ -138,7 +139,8 @@ const linkMenu = (page: string) => {
 };
 
 const linkUserInfo = () => {
-    window.location.href = baseHost + "/v/userinfo";
+    // 头像/姓名点击统一跳 UserHome 设置页「个人信息」pane（默认头像轮 2026-09-30，原 /v/userinfo 已下线语义）
+    window.location.href = baseHost + "/userhome/front/index.html#/settings?pane=profile";
 };
 const logout = () => {
     let url = window.location.href;
@@ -174,7 +176,7 @@ function linkHomePage() {
             <h4 class="fl align-middle">{{ appName }}</h4>
             <div class="school-bg"></div>
             <div class="header-aside fr">
-                <img :src="userInfo.avatar" class="fl align-middle" @click="linkUserInfo" />
+                <UserAvatar class="fl align-middle" :src="userInfo.avatar" :name="userInfo.name" :size="28" placement="brand" @click="linkUserInfo" />
                 <a class="name fl align-middle text-ellipsis" href="javascript:void(0);" @click="linkUserInfo">
                     {{ userInfo.name }}
                 </a>