fix: for thesis

src/components/userProfile.vue

@@ -1,7 +1,8 @@
 <template>
-  <router-link to="/home/user" v-if="userinfo.user.u_avatar" class="user-profile-link">
+  <router-link to="/home/user" class="user-profile-link">
     <div class="user-profile">
-      <img :src="userinfo.user.u_avatar" alt="User Avatar" />
+      <!-- 原逻辑：:src="userinfo.user.u_avatar"（远端头像） -->
+      <img :src="defaultAvatar" alt="User Avatar" />
       <div :class="['status-dot', statusClass]"></div>
     </div>
   </router-link>
@@ -11,6 +12,7 @@
 <script setup>
 import { ref, computed } from 'vue';
 import { userInfoStore } from '@/store/user.ts';
+import defaultAvatar from '@/assets/defaultavatar.jpg';
 
 const userinfo = userInfoStore();