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_nonwindows_test.go

@@ -0,0 +1,23 @@
+//go:build !windows
+
+package transport
+
+import (
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestDialNamedPipeUnsupportedOnNonWindows(t *testing.T) {
+	_, err := DialTimeout("npipe", "notify-demo", time.Millisecond)
+	if !errors.Is(err, ErrNamedPipeUnsupported) {
+		t.Fatalf("DialTimeout error = %v, want %v", err, ErrNamedPipeUnsupported)
+	}
+}
+
+func TestListenNamedPipeUnsupportedOnNonWindows(t *testing.T) {
+	_, err := Listen("npipe", "notify-demo")
+	if !errors.Is(err, ErrNamedPipeUnsupported) {
+		t.Fatalf("Listen error = %v, want %v", err, ErrNamedPipeUnsupported)
+	}
+}