fix(editor): 从localStorage获取用户名显示在欢迎页

frontend/vue-demo/src/views/Editor.vue

@@ -597,7 +597,7 @@ const currentReportId = ref(null)
 const hasActiveDocument = computed(() => !!currentDocumentId.value)
 
 // 欢迎页问候语
-const userName = ref('用户')  // TODO: 从用户信息获取
+const userName = computed(() => localStorage.getItem('username') || '用户')
 const greetingText = computed(() => {
   const hour = new Date().getHours()
   if (hour < 6) return '凌晨好'