refactor: 优化去背景工具代码，消除文件内部重复

- 在文件内部提取 handleSuccess 辅助函数，消除成功处理逻辑重复
- 简化流式响应处理代码，提高可读性和可维护性
- 保持工具文件独立性，符合设计原则

src/views/HomePage.vue

@@ -517,11 +517,30 @@ const handleRemoveBackground = async () => {
   processing.value = true
   resultImage.value = ''
 
+  // 处理成功结果的辅助函数（文件内部使用）
+  const handleSuccess = async (imageUrl: string): Promise<void> => {
+    resultImage.value = imageUrl
+    await cacheResultImage(imageUrl)
+    
+    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: imageUrl,
+        timestamp: Date.now()
+      }
+      historyList.value.unshift(historyItem)
+      currentHistoryIndex.value = 0
+    } else if (currentHistoryIndex.value >= 0) {
+      historyList.value[currentHistoryIndex.value].resultImage = imageUrl
+    }
+  }
+
   try {
     const formData = new FormData()
     formData.append('file', uploadedImage.value)
 
-    // 使用 fetch 处理流式响应（NDJSON 格式）
     const controller = new AbortController()
     const timeoutId = setTimeout(() => controller.abort(), 180000)
     
@@ -537,7 +556,6 @@ const handleRemoveBackground = async () => {
       throw new Error(`HTTP error! status: ${response.status}`)
     }
 
-    // 读取流式响应（NDJSON 格式，每行一个 JSON 对象）
     const reader = response.body?.getReader()
     const decoder = new TextDecoder()
     let buffer = ''
@@ -552,38 +570,17 @@ const handleRemoveBackground = async () => {
 
       buffer += decoder.decode(value, { stream: true })
       const lines = buffer.split('\n')
-      buffer = lines.pop() || '' // 保留最后一个不完整的行
+      buffer = lines.pop() || ''
 
-      // 处理完整的行
       for (const line of lines) {
         if (line.trim()) {
           try {
             const result = JSON.parse(line.trim())
-            
-            // 后端返回格式：{"status": "success", "image_url": "..."}
             if (result.status === 'success' && result.image_url) {
-              resultImage.value = result.image_url
+              await handleSuccess(result.image_url)
-              
+              return
-              // 缓存图片 blob URL 用于下载
+            } else if (result.error) {
-              await cacheResultImage(result.image_url)
+              message.error(result.error)
-              
-              // 添加到历史记录
-              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: result.image_url,
-                  timestamp: Date.now()
-                }
-                historyList.value.unshift(historyItem)
-                currentHistoryIndex.value = 0
-              } else if (currentHistoryIndex.value >= 0) {
-                historyList.value[currentHistoryIndex.value].resultImage = result.image_url
-              }
-              return // 成功处理，退出
-            } else {
-              message.error(result.error || t('Failed to remove background'))
             }
           } catch (parseError) {
             console.error('Failed to parse JSON:', parseError, 'Line:', line)
@@ -597,22 +594,7 @@ const handleRemoveBackground = async () => {
       try {
         const result = JSON.parse(buffer.trim())
         if (result.status === 'success' && result.image_url) {
-          resultImage.value = result.image_url
+          await handleSuccess(result.image_url)
-          await cacheResultImage(result.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: result.image_url,
-              timestamp: Date.now()
-            }
-            historyList.value.unshift(historyItem)
-            currentHistoryIndex.value = 0
-          } else if (currentHistoryIndex.value >= 0) {
-            historyList.value[currentHistoryIndex.value].resultImage = result.image_url
-          }
           return
         } else {
           message.error(result.error || t('Failed to remove background'))

src/views/tools/remove_background/remove_background.vue

@@ -608,11 +608,30 @@ const handleRemoveBackground = async () => {
   processing.value = true
   resultImage.value = ''
 
+  // 处理成功结果的辅助函数（文件内部使用）
+  const handleSuccess = async (imageUrl: string): Promise<void> => {
+    resultImage.value = imageUrl
+    await cacheResultImage(imageUrl)
+    
+    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: imageUrl,
+        timestamp: Date.now()
+      }
+      historyList.value.unshift(historyItem)
+      currentHistoryIndex.value = 0
+    } else if (currentHistoryIndex.value >= 0) {
+      historyList.value[currentHistoryIndex.value].resultImage = imageUrl
+    }
+  }
+
   try {
     const formData = new FormData()
     formData.append('file', uploadedImage.value)
 
-    // 使用 fetch 处理流式响应（NDJSON 格式）
     const controller = new AbortController()
     const timeoutId = setTimeout(() => controller.abort(), 180000)
     
@@ -628,7 +647,6 @@ const handleRemoveBackground = async () => {
       throw new Error(`HTTP error! status: ${response.status}`)
     }
 
-    // 读取流式响应（NDJSON 格式，每行一个 JSON 对象）
     const reader = response.body?.getReader()
     const decoder = new TextDecoder()
     let buffer = ''
@@ -643,37 +661,17 @@ const handleRemoveBackground = async () => {
 
       buffer += decoder.decode(value, { stream: true })
       const lines = buffer.split('\n')
-      buffer = lines.pop() || '' // 保留最后一个不完整的行
+      buffer = lines.pop() || ''
 
-      // 处理完整的行
       for (const line of lines) {
         if (line.trim()) {
           try {
             const result = JSON.parse(line.trim())
-            
-            // 后端返回格式：{"status": "success", "image_url": "..."}
             if (result.status === 'success' && result.image_url) {
-              resultImage.value = result.image_url
+              await handleSuccess(result.image_url)
-              
+              return
-              // 缓存图片 blob URL 用于下载
+            } else if (result.error) {
-              await cacheResultImage(result.image_url)
+              message.error(result.error)
-              
-              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: result.image_url,
-                  timestamp: Date.now()
-                }
-                historyList.value.unshift(historyItem)
-                currentHistoryIndex.value = 0
-              } else if (currentHistoryIndex.value >= 0) {
-                historyList.value[currentHistoryIndex.value].resultImage = result.image_url
-              }
-              return // 成功处理，退出
-            } else {
-              message.error(result.error || t('Failed to remove background'))
             }
           } catch (parseError) {
             console.error('Failed to parse JSON:', parseError, 'Line:', line)
@@ -687,22 +685,7 @@ const handleRemoveBackground = async () => {
       try {
         const result = JSON.parse(buffer.trim())
         if (result.status === 'success' && result.image_url) {
-          resultImage.value = result.image_url
+          await handleSuccess(result.image_url)
-          await cacheResultImage(result.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: result.image_url,
-              timestamp: Date.now()
-            }
-            historyList.value.unshift(historyItem)
-            currentHistoryIndex.value = 0
-          } else if (currentHistoryIndex.value >= 0) {
-            historyList.value[currentHistoryIndex.value].resultImage = result.image_url
-          }
           return
         } else {
           message.error(result.error || t('Failed to remove background'))