refactor(course-detail): 将教师信息改为支持多个讲师显示

修改了课程详情页的教师信息部分，使其支持显示多个讲师的信息。将`teacher`变量替换为`lecturers`数组，并更新了相关模板和逻辑，以便正确渲染每个讲师的详细内容。

@@ -96,18 +96,18 @@
           </div>
         </FrostedGlass>
 
-        <!-- Teacher Introduction -->
+        <!-- lecturers Introduction -->
         <FrostedGlass class="mb-6 p-4 rounded-xl">
           <h3 class="text-lg font-bold text-gray-800 mb-3">主讲老师</h3>
-          <div class="flex items-center">
+          <div v-for="(item, index) in lecturers" :key="index" class="flex items-center">
             <div class="w-16 h-16 rounded-full overflow-hidden mr-4">
-              <img :src="teacher?.avatar || 'https://cdn.ipadbiz.cn/mlaj/images/default_block.png'" alt="Teacher"
+              <img :src="item?.photo || 'https://cdn.ipadbiz.cn/mlaj/images/default_block.png'" alt="lecturer"
                 class="w-full h-full object-cover" @error="handleImageError" />
             </div>
             <div>
-              <h4 class="font-bold text-gray-900">{{ teacher?.name || '没字段' }}</h4>
-              <p class="text-sm text-gray-600">{{ teacher?.position || '没字段' }}</p>
-              <p class="text-xs text-gray-500 mt-1">{{ teacher?.description || '没字段' }}</p>
+              <h4 class="font-bold text-gray-900">{{ item?.name }}</h4>
+              <p class="text-sm text-gray-600">{{ item?.educational }}</p>
+              <p class="text-xs text-gray-500 mt-1">{{ item?.introduce }}</p>
             </div>
           </div>
         </FrostedGlass>
@@ -238,7 +238,7 @@ const route = useRoute()
 const router = useRouter()
 
 const course = ref(null)
-const teacher = ref(null)
+const lecturers = ref([])
 const activeTab = ref('课程特色')
 // 是否收藏状态
 const isFavorite = ref(false)
@@ -366,12 +366,7 @@ onMounted(async () => {
     const foundCourse = data;
     if (foundCourse) {
       course.value = foundCourse;
-      teacher.value = {
-        name: '',
-        avatar: '',
-        position: '',
-        description: '',
-      }
+      lecturers.value = foundCourse.lecturer;
       isFavorite.value = foundCourse.is_favorite;
       isPurchased.value = foundCourse.is_buy;
       isReviewed.value = foundCourse.is_comment;