refactor: 重构trustlog-sdk目录结构到trustlog/go-trustlog

- 将所有trustlog-sdk文件移动到trustlog/go-trustlog/目录
- 更新README中所有import路径从trustlog-sdk改为go-trustlog
- 更新cookiecutter配置文件中的项目名称
- 更新根目录.lefthook.yml以引用新位置的配置
- 添加go.sum文件到版本控制
- 删除过时的示例文件

这次重构与trustlog-server保持一致的目录结构，
为未来支持多语言SDK（Python、Java等）预留空间。

api/model/operation_timestamp_test.go

@@ -0,0 +1,56 @@
+package model_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"go.yandata.net/iod/iod/trustlog-sdk/api/model"
+)
+
+// TestOperation_TimestampNanosecondPrecision 验证 Operation 的时间戳在 CBOR 序列化/反序列化后能保留纳秒精度
+func TestOperation_TimestampNanosecondPrecision(t *testing.T) {
+	t.Parallel()
+
+	// 创建一个包含纳秒精度的时间戳
+	timestamp := time.Date(2024, 1, 1, 12, 30, 45, 123456789, time.UTC)
+
+	original := &model.Operation{
+		OpID:         "op-nanosecond-test",
+		Timestamp:    timestamp,
+		OpSource:     model.OpSourceIRP,
+		OpType:       model.OpTypeOCCreateHandle,
+		DoPrefix:     "test",
+		DoRepository: "repo",
+		Doid:         "test/repo/123",
+		ProducerID:   "producer-1",
+		OpActor:      "actor-1",
+	}
+
+	err := original.CheckAndInit()
+	require.NoError(t, err)
+
+	t.Logf("Original timestamp: %v", original.Timestamp)
+	t.Logf("Original nanoseconds: %d", original.Timestamp.Nanosecond())
+
+	// 序列化
+	data, err := original.MarshalBinary()
+	require.NoError(t, err)
+	require.NotNil(t, data)
+
+	// 反序列化
+	result := &model.Operation{}
+	err = result.UnmarshalBinary(data)
+	require.NoError(t, err)
+
+	t.Logf("Decoded timestamp: %v", result.Timestamp)
+	t.Logf("Decoded nanoseconds: %d", result.Timestamp.Nanosecond())
+
+	// 验证纳秒精度被完整保留
+	assert.Equal(t, original.Timestamp.UnixNano(), result.Timestamp.UnixNano(),
+		"时间戳的纳秒精度应该被完整保留")
+	assert.Equal(t, original.Timestamp.Nanosecond(), result.Timestamp.Nanosecond(),
+		"纳秒部分应该相等")
+}