fix: 优化去背景图片下载功能，使用图片URL直接下载

- 修改后端返回格式，从返回base64图片内容改为返回图片URL
- 前端直接使用返回的图片URL进行下载，避免创建blob URL导致的安全警告
- 简化图片显示逻辑，直接使用URL而不是base64编码
- 修复下载功能中的HTTP安全警告问题

apps/jingrow/frontend/src/views/tools/RemoveBackground.vue

@@ -181,10 +181,8 @@ const uploadedImageUrl = ref<string>('')
 const resultImage = ref<string>('')
 const resultImageUrl = computed(() => {
   if (!resultImage.value) return ''
-  if (resultImage.value.startsWith('data:')) {
-    return resultImage.value
-  }
-  return `data:image/png;base64,${resultImage.value}`
+  // 直接返回图片URL
+  return resultImage.value
 })
 
 const historyList = ref<HistoryItem[]>([])
@@ -355,10 +353,7 @@ const selectHistoryItem = (index: number) => {
 
 const getHistoryThumbnailUrl = (item: HistoryItem): string => {
   if (item.resultImage) {
-    if (item.resultImage.startsWith('data:')) {
-      return item.resultImage
-    }
-    return `data:image/png;base64,${item.resultImage}`
+    return item.resultImage
   }
   return item.originalImageUrl
 }
@@ -430,21 +425,22 @@ const handleRemoveBackground = async () => {
       if (result.success) {
         if (result.data && Array.isArray(result.data) && result.data.length > 0) {
           const firstResult = result.data[0]
-          if (firstResult.success && firstResult.image_content) {
-            resultImage.value = firstResult.image_content
+          
+          if (firstResult.success && firstResult.image_url) {
+            resultImage.value = firstResult.image_url
             
             if (currentHistoryIndex.value === -1 && uploadedImage.value && uploadedImageUrl.value) {
               const historyItem: HistoryItem = {
                 id: `history-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
                 originalImageUrl: uploadedImageUrl.value,
                 originalImageFile: uploadedImage.value,
-                resultImage: firstResult.image_content,
+                resultImage: firstResult.image_url,
                 timestamp: Date.now()
               }
               historyList.value.unshift(historyItem)
               currentHistoryIndex.value = 0
             } else if (currentHistoryIndex.value >= 0) {
-              historyList.value[currentHistoryIndex.value].resultImage = firstResult.image_content
+              historyList.value[currentHistoryIndex.value].resultImage = firstResult.image_url
             }
             
             message.success(t('Background removed successfully!'))
@@ -487,36 +483,25 @@ const handleRemoveBackground = async () => {
   }
 }
 
-const handleDownload = () => {
+const handleDownload = async () => {
   if (!resultImage.value) return
 
   try {
-    const base64Data = resultImage.value.includes(',') 
-      ? resultImage.value.split(',')[1] 
-      : resultImage.value
-    
-    const byteCharacters = atob(base64Data)
-    const byteNumbers = new Array(byteCharacters.length)
-    for (let i = 0; i < byteCharacters.length; i++) {
-      byteNumbers[i] = byteCharacters.charCodeAt(i)
-    }
-    const byteArray = new Uint8Array(byteNumbers)
-    const blob = new Blob([byteArray], { type: 'image/png' })
-    const url = URL.createObjectURL(blob)
     const link = document.createElement('a')
-    link.href = url
+    link.href = resultImage.value
     link.download = `removed-background-${Date.now()}.png`
+    link.target = '_blank'
     link.style.display = 'none'
     document.body.appendChild(link)
     link.click()
     
     setTimeout(() => {
       document.body.removeChild(link)
-      URL.revokeObjectURL(url)
     }, 100)
 
     message.success(t('Download started'))
   } catch (error: any) {
+    console.error('下载图片失败:', error)
     message.error(t('Failed to download image'))
   }
 }

apps/jingrow/jingrow/tools/tools.py

@@ -91,29 +91,26 @@ def remove_background(image_data: Union[str, list]) -> Dict[str, Any]:
         
         if response.status_code == 200:
             result_data = response.json()
-            # 处理返回的图片内容
-            if 'image_content' in result_data:
-                image_content = result_data.get('image_content', '')
-                # 如果包含 data:image 前缀，提取base64部分
-                if ',' in image_content:
-                    image_content = image_content.split(',')[1]
-                
+            
+            # 使用 image_url 字段
+            if 'image_url' in result_data:
+                image_url = result_data.get('image_url', '')
                 return {
                     "success": True,
                     "data": [{
                         "success": True,
-                        "image_content": image_content,
+                        "image_url": image_url,
                         "index": 1,
                         "total": 1
                     }],
                     "total_processed": 1,
                     "total_success": 1
                 }
-            else:
-                return {
-                    "success": False,
-                    "error": result_data.get('error', '未知错误')
-                }
+            
+            return {
+                "success": False,
+                "error": result_data.get('error', '未找到图片URL')
+            }
         else:
             try:
                 error_data = response.json()