修正多处问题，添加骨架屏

gym-manage-uniapp/components/recommendCourses/RecommendCourseCard.vue

@@ -49,6 +49,7 @@
 
 <script setup>
 import { computed } from 'vue'
+import { getCourseCoverUrl } from '@/utils/request.js'
 
 const props = defineProps({
   recommend: {
@@ -91,9 +92,14 @@ const courseId = computed(() => props.recommend.groupCourse?.id)
 // 课程封面图片
 const courseImage = computed(() => {
   const coverImage = props.recommend.groupCourse?.coverImage
-  if (!coverImage) return 'https://images.unsplash.com/photo-1534438327276-14e5300c3a48?w=400&q=80'
-  if (coverImage.startsWith('http')) return coverImage
-  return `https://your-domain.com${coverImage}`
+  const url = getCourseCoverUrl(coverImage) || 'https://images.unsplash.com/photo-1534438327276-14e5300c3a48?w=400&q=80'
+  console.log('[RecommendCourseCard] 封面URL:', {
+    'courseName': props.recommend.groupCourse?.courseName,
+    '原始coverImage': coverImage,
+    '转换后URL': url,
+    '是否完整URL': url && url.startsWith('http')
+  })
+  return url
 })
 
 // 课程标签文本