fix: 修复系统消息API响应数据格式解析错误

src/views/teacher/message/components/SystemMessages.vue

@@ -53,7 +53,7 @@
       </button>
 
       <span v-if="showEllipsis" class="ellipsis">...</span>
-      <button class="page-btn" @click="goToPage(totalPages)">{{ totalPages }}</button>
+      <button v-if="showLastPage" class="page-btn" @click="goToPage(totalPages)">{{ totalPages }}</button>
 
       <button class="page-btn nav-btn" :disabled="currentPage === totalPages"
         @click="goToPage(currentPage + 1)">下一页</button>
@@ -95,6 +95,10 @@ const showEllipsis = computed(() => {
   return currentPage.value + 2 < totalPages.value - 1
 })
 
+const showLastPage = computed(() => {
+  return totalPages.value > 1 && !visiblePages.value.includes(totalPages.value)
+})
+
 // 数据转换函数
 const transformSystemMessageData = (backendItem: BackendMessageItem): SystemMessage => {
   let title = backendItem.titile || '系统消息'
@@ -178,6 +182,10 @@ const loadMessages = async () => {
         // 如果返回包含records的对象
         messages.value = result.records.map(transformSystemMessageData)
         total.value = result.total || result.records.length
+      } else if ((result as any).result && (result as any).result.records && Array.isArray((result as any).result.records)) {
+        // 如果返回嵌套的result结构
+        messages.value = (result as any).result.records.map(transformSystemMessageData)
+        total.value = (result as any).result.total || (result as any).result.records.length
       } else {
         // 其他情况，使用模拟数据
         console.warn('⚠️ 系统消息API返回数据格式不正确:', result)