fix(pipe): prevent error swallowing and goroutine leak in Pipe/Transport

Pipe: remove context.WithCancel that caused premature ctx.Done()
before the second pipeHalf could return its error. Replace with a
completed counter that drains both errors even on cancellation.

Transport: increase error channel buffer from 1 to 2 to prevent
goroutine leak when both CopyBuffer goroutines complete.

internal/net/pipe.go

@@ -15,34 +15,32 @@ const (
 	readTimeout    = 30 * time.Second
 )
 
-// Pipe 在两个连接之间建立双向数据通道
 func Pipe(ctx context.Context, rw1, rw2 io.ReadWriteCloser) error {
-	ctx, cancel := context.WithCancel(ctx)
-	defer cancel()
-
 	errCh := make(chan error, 2)
 
-	// 启动两个方向的传输
-	go func() {
-		errCh <- pipeHalf(ctx, rw1, rw2)
-	}()
+	go func() { errCh <- pipeHalf(ctx, rw1, rw2) }()
+	go func() { errCh <- pipeHalf(ctx, rw2, rw1) }()
 
-	go func() {
-		errCh <- pipeHalf(ctx, rw2, rw1)
-	}()
-
-	// 等待第一个错误或完成
 	var firstErr error
-	for i := 0; i < 2; i++ {
+	completed := 0
+	for completed < 2 {
 		select {
 		case err := <-errCh:
+			completed++
 			if firstErr == nil && err != nil {
 				firstErr = err
-				cancel() // 一个方向出错，取消另一个
 			}
 		case <-ctx.Done():
-			// 超时或主动取消
 			forceClose(rw1, rw2)
+			for completed < 2 {
+				if err := <-errCh; firstErr == nil && err != nil {
+					firstErr = err
+				}
+				completed++
+			}
+			if firstErr != nil {
+				return firstErr
+			}
 			return ctx.Err()
 		}
 	}
@@ -60,7 +58,6 @@ func pipeHalf(ctx context.Context, src, dst io.ReadWriteCloser) error {
 	buf := bufpool.Get(bufferSize / 2)
 	defer bufpool.Put(buf)
 
-
 	// 创建带超时的读取器
 	reader := &readDeadliner{
 		Reader: src,

internal/net/transport.go

@@ -11,7 +11,7 @@ const (
 )
 
 func Transport(rw1, rw2 io.ReadWriter) error {
-	errc := make(chan error, 1)
+	errc := make(chan error, 2)
 	go func() {
 		errc <- CopyBuffer(rw1, rw2, bufferSize)
 	}()