feat(notify): 重构通信内核并补齐 stream/bulk/record/transfer 能力

- 引入 LogicalConn/TransportConn 分层，ClientConn 保留兼容适配层
  - 新增 Stream、Bulk、RecordStream 三条数据面能力及对应控制路径
  - 完成 transfer/file 传输内核与状态快照、诊断能力
  - 补齐 reconnect、inbound dispatcher、modern psk 等基础模块
  - 增加大规模回归、并发与基准测试覆盖
  - 更新依赖库

internal/transport/stream_windows_test.go

@@ -0,0 +1,77 @@
+//go:build windows
+
+package transport
+
+import (
+	"fmt"
+	"io"
+	"testing"
+	"time"
+)
+
+func TestNamedPipeRoundTripByteMode(t *testing.T) {
+	pipeName := fmt.Sprintf("notify-npipe-test-%d", time.Now().UnixNano())
+	listener, err := Listen("npipe", pipeName)
+	if err != nil {
+		t.Fatalf("Listen failed: %v", err)
+	}
+	defer func() {
+		_ = listener.Close()
+	}()
+
+	serverErr := make(chan error, 1)
+	go func() {
+		conn, err := listener.Accept()
+		if err != nil {
+			serverErr <- err
+			return
+		}
+		defer func() {
+			_ = conn.Close()
+		}()
+
+		buf := make([]byte, 4)
+		if _, err := io.ReadFull(conn, buf); err != nil {
+			serverErr <- err
+			return
+		}
+		if got, want := string(buf), "ping"; got != want {
+			serverErr <- fmt.Errorf("server got %q, want %q", got, want)
+			return
+		}
+		if _, err := conn.Write([]byte("pong")); err != nil {
+			serverErr <- err
+			return
+		}
+		serverErr <- nil
+	}()
+
+	conn, err := DialTimeout("npipe", pipeName, 2*time.Second)
+	if err != nil {
+		t.Fatalf("DialTimeout failed: %v", err)
+	}
+	defer func() {
+		_ = conn.Close()
+	}()
+
+	if _, err := conn.Write([]byte("ping")); err != nil {
+		t.Fatalf("client write failed: %v", err)
+	}
+
+	reply := make([]byte, 4)
+	if _, err := io.ReadFull(conn, reply); err != nil {
+		t.Fatalf("client read failed: %v", err)
+	}
+	if got, want := string(reply), "pong"; got != want {
+		t.Fatalf("client got %q, want %q", got, want)
+	}
+
+	select {
+	case err := <-serverErr:
+		if err != nil {
+			t.Fatalf("server error: %v", err)
+		}
+	case <-time.After(2 * time.Second):
+		t.Fatal("server timeout")
+	}
+}