refactor(sandbox): remove unused imports from sandbox example

Remove unused path import and unnecessary Sandbox type import
from the sandbox example file to clean up code and reduce
dependencies.

移除未使用的导入以清理代码示例并减少依赖项。

Change-Id: If120626c1e173339e8a0e438eb9b9eba4a82c205
Signed-off-by: OhYee <oyohyee@oyohyee.com>

Author: OhYee

examples/sandbox.ts

@@ -14,15 +14,13 @@
  */
 
 import * as fs from 'fs/promises';
-import * as path from 'path';
 
 import {
   CodeInterpreterSandbox,
   CodeLanguage,
-  Sandbox,
   SandboxClient,
   Template,
-  TemplateType,
+  TemplateType
 } from '../src/index';
 import { logger } from '../src/utils/log';