fix: 修复上传取消功能，确保 HTTP 请求正确中止

- 在 XMLHttpRequest 中添加 signal.aborted 检查
- 修复 useSliceUpload 中的 cancelFn 闭包问题
- 确保流式上传和分片上传都能正确取消

frontend/src/hooks/useSliceUpload.tsx

@@ -99,8 +99,14 @@ export function useFileSliceUpload(
     if (!task) {
       return;
     }
-    const { reqId, key } = task;
+    const { reqId, key, controller } = task;
     const { loaded, i, j, files, totalSize } = fileInfo;
+    
+    // 检查是否已取消
+    if (controller.signal.aborted) {
+      throw new Error("Upload cancelled");
+    }
+    
     const formData = await buildFormData({
       file: files[i],
       i,
@@ -110,6 +116,7 @@ export function useFileSliceUpload(
 
     let newTask = { ...task };
     await uploadChunk(key, formData, {
+      signal: controller.signal,
       onUploadProgress: (e) => {
         const loadedSize = loaded + e.loaded;
         const curPercent = Number((loadedSize / totalSize) * 100).toFixed(2);
@@ -141,9 +148,10 @@ export function useFileSliceUpload(
       reqId,
       isCancel: false,
       cancelFn: () => {
-        task.controller.abort();
+        // 使用 newTask 的 controller 确保一致性
+        newTask.controller.abort();
         cancelUpload?.(reqId);
-        if (task.updateEvent) window.dispatchEvent(new Event(task.updateEvent));
+        if (newTask.updateEvent) window.dispatchEvent(new Event(newTask.updateEvent));
       },
     };
     updateTaskList(newTask);
@@ -153,8 +161,16 @@ export function useFileSliceUpload(
 
     let loaded = 0;
     for (let i = 0; i < files.length; i++) {
+      // 检查是否已取消
+      if (newTask.controller.signal.aborted) {
+        throw new Error("Upload cancelled");
+      }
       const { slices } = files[i];
       for (let j = 0; j < slices.length; j++) {
+        // 检查是否已取消
+        if (newTask.controller.signal.aborted) {
+          throw new Error("Upload cancelled");
+        }
         await uploadSlice(newTask, {
           loaded,
           i,
@@ -219,9 +235,10 @@ export function useFileSliceUpload(
         reqId,
         isCancel: false,
         cancelFn: () => {
-          task.controller.abort();
+          // 使用 newTask 的 controller 确保一致性
+          newTask.controller.abort();
           cancelUpload?.(reqId);
-          if (task.updateEvent) window.dispatchEvent(new Event(task.updateEvent));
+          if (newTask.updateEvent) window.dispatchEvent(new Event(newTask.updateEvent));
         },
       };
       updateTaskList(newTask);
@@ -232,13 +249,26 @@ export function useFileSliceUpload(
 
       // 逐个处理文件
       for (let i = 0; i < files.length; i++) {
+        // 检查是否已取消
+        if (newTask.controller.signal.aborted) {
+          throw new Error("Upload cancelled");
+        }
+        
         const file = files[i];
         console.log(`[useSliceUpload] Processing file ${i + 1}/${files.length}: ${file.name}`);
         
         const result = await streamSplitAndUpload(
           file,
-          (formData, config) => uploadChunk(task.key, formData, config),
+          (formData, config) => uploadChunk(task.key, formData, {
+            ...config,
+            signal: newTask.controller.signal,
+          }),
           (currentBytes, totalBytes, uploadedLines) => {
+            // 检查是否已取消
+            if (newTask.controller.signal.aborted) {
+              return;
+            }
+            
             // 更新进度
             const overallBytes = totalProcessedBytes + currentBytes;
             const curPercent = Number((overallBytes / totalSize) * 100).toFixed(2);
@@ -260,9 +290,9 @@ export function useFileSliceUpload(
           1024 * 1024, // 1MB chunk size
           {
             reqId,
-            hasArchive: task.hasArchive,
-            prefix: task.prefix,
-            signal: task.controller.signal,
+            hasArchive: newTask.hasArchive,
+            prefix: newTask.prefix,
+            signal: newTask.controller.signal,
             maxConcurrency: 3,
           }
         );

frontend/src/utils/file.util.ts

@@ -442,6 +442,11 @@ export async function streamSplitAndUpload(
    * 上传单行内容
    */
   async function uploadLine(line: string, index: number): Promise<void> {
+    // 检查是否已取消
+    if (signal?.aborted) {
+      throw new Error("Upload cancelled");
+    }
+    
     if (!line.trim()) {
       skippedEmptyCount++;
       return;
@@ -455,6 +460,11 @@ export async function streamSplitAndUpload(
     const slices = sliceFile(lineFile, DEFAULT_CHUNK_SIZE);
     const checkSum = await calculateSHA256(slices[0]);
     
+    // 检查是否已取消（计算哈希后）
+    if (signal?.aborted) {
+      throw new Error("Upload cancelled");
+    }
+    
     const formData = new FormData();
     formData.append("file", slices[0]);
     formData.append("reqId", reqId.toString());

frontend/src/utils/request.ts

@@ -92,6 +92,14 @@ class Request {
         });
       }
 
+      // 监听 AbortSignal 来中止请求
+      if (config.signal) {
+        config.signal.addEventListener("abort", () => {
+          xhr.abort();
+          reject(new Error("上传已取消"));
+        });
+      }
+
       // 监听上传进度
       xhr.upload.addEventListener("progress", function (event) {
         if (event.lengthComputable) {