fix: cleanup temp files when task is cancelled

任务取消时清理临时文件（.audio/.video），避免残留

Co-Authored-By: AI

.gitignore

@@ -21,3 +21,4 @@ backup/
 download/
 bin/
 cmd/bilidown/static
+.claude

internal/task/task.go

@@ -75,6 +75,23 @@ var GlobalTaskMux = &sync.Mutex{}
 var GlobalDownloadSem = util.NewSemaphore(3)
 var GlobalMergeSem = util.NewSemaphore(3)
 
+// cleanupTempFiles 清理任务的临时文件
+func (task *Task) cleanupTempFiles() {
+	if task.Folder == "" || task.ID == 0 {
+		return
+	}
+	tempFiles := []string{
+		filepath.Join(task.Folder, strconv.FormatInt(task.ID, 10)+".audio"),
+		filepath.Join(task.Folder, strconv.FormatInt(task.ID, 10)+".video"),
+	}
+	for _, f := range tempFiles {
+		if _, err := os.Stat(f); err == nil {
+			os.Remove(f)
+			logger.Debugf("清理临时文件: %s", f)
+		}
+	}
+}
+
 // CancelTask 取消指定任务
 func CancelTask(taskID int64) bool {
 	GlobalTaskMux.Lock()
@@ -129,7 +146,9 @@ func (task *Task) Start() {
 
 	// 检查是否已取消
 	if task.Cancelled {
-		task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
+		task.cleanupTempFiles()
+		task.cleanupTempFiles()
+				task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
 		return
 	}
 
@@ -152,7 +171,8 @@ func (task *Task) Start() {
 	// 再次检查是否已取消
 	if task.Cancelled {
 		GlobalDownloadSem.Release()
-		task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
+		task.cleanupTempFiles()
+				task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
 		return
 	}
 
@@ -165,6 +185,7 @@ func (task *Task) Start() {
 		if err != nil || task.Cancelled {
 			GlobalDownloadSem.Release()
 			if task.Cancelled {
+				task.cleanupTempFiles()
 				task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
 			} else {
 				task.UpdateStatus(db, "error", fmt.Errorf("DownloadMedia: %v", err))
@@ -192,6 +213,7 @@ func (task *Task) Start() {
 		if err != nil || task.Cancelled {
 			GlobalDownloadSem.Release()
 			if task.Cancelled {
+				task.cleanupTempFiles()
 				task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
 			} else {
 				task.UpdateStatus(db, "error", fmt.Errorf("DownloadMedia: %v", err))
@@ -219,6 +241,7 @@ func (task *Task) Start() {
 		if err != nil || task.Cancelled {
 			GlobalDownloadSem.Release()
 			if task.Cancelled {
+				task.cleanupTempFiles()
 				task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
 			} else {
 				task.UpdateStatus(db, "error", fmt.Errorf("DownloadMedia: %v", err))
@@ -229,6 +252,7 @@ func (task *Task) Start() {
 		if err != nil || task.Cancelled {
 			GlobalDownloadSem.Release()
 			if task.Cancelled {
+				task.cleanupTempFiles()
 				task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
 			} else {
 				task.UpdateStatus(db, "error", fmt.Errorf("DownloadMedia: %v", err))
@@ -238,7 +262,8 @@ func (task *Task) Start() {
 		GlobalDownloadSem.Release()
 
 		if task.Cancelled {
-			task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
+			task.cleanupTempFiles()
+				task.UpdateStatus(db, "error", fmt.Errorf("任务已取消"))
 			return
 		}