添加本地服务端口配置项，允许用户自定义发送JSON数据的端口号

- 在localClient.ts中实现从配置读取端口号，默认值为26000
- 在package.json中添加squirrel.localServicePort配置项
- 用户现在可以通过VS Code设置自定义本地C++服务端口

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -122,6 +122,11 @@
             "UTF-8",
             "Unicode"
           ]
+        },
+        "squirrel.localServicePort": {
+          "type": "number",
+          "default": 26000,
+          "description": "本地C++服务端口，用于发送保存的NUT文件"
         }
       }
     }