Upload public.js

backend/src/routes/public.js

@@ -367,8 +367,8 @@ router.post('/generate-share-link', async (req, res, next) => {
       pptUrl: `${protocol}://${baseUrl}/api/public/ppt/${userId}/${pptId}`,
       // Frontend view link
       viewUrl: `${protocol}://${baseUrl}/public/${userId}/${pptId}/${slideIndex}`,
-      // Screenshot link (需要用户交互)
-      screenshotUrl: `${protocol}://${baseUrl}/api/public/screenshot/${userId}/${pptId}/${slideIndex}`,
+      // Screenshot link (直接返回图片)
+      screenshotUrl: `${protocol}://${baseUrl}/api/public/image/${userId}/${pptId}/${slideIndex}?format=jpg&quality=90`,
       // 新增：直接图片URL (无需用户交互)
       directImageUrl: `${protocol}://${baseUrl}/api/public/direct-image/${userId}/${pptId}/${slideIndex}`,
       // Add PPT information