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。

cookiecutter-config-file.yml

@@ -0,0 +1,18 @@
+# This project was generated using a Cookiecutter template:
+#       https://github.com/daotl/go-template
+
+cookiecutter_inputs:
+  project_name: "go-trustlog"
+  go_module_path: "gitea.internetapi.cn/trustlog-sd"
+  license_owner: "example"
+  base_branch: "main"
+  contact_email: ""
+  project_description: "TrustlogSdk is a Go application created using https://github.com/daotl/go-template"
+  github_specific_features: "n"
+  private_project: "y"
+  use_codecov: "y"
+  use_lefthook: "y"
+  use_precommit: "y"
+  go_version: "1.24"
+  go_toolchain_version: "1.24.5"
+  license: "MIT"