chore: change license from LGPL to GPL

Changed the project license from LGPL-3.0-or-later to GPL-3.0-or-later
Updated LICENSE file content from LGPL to GPL version 3
Modified README.md and README.zh_CN.md to reflect the license change
Updated debian/copyright file to reference GPL-3+ instead of LGPL-3+
This change aligns the project with GPL licensing requirements and
ensures consistent licensing across all project files

Influence:
1. Verify license headers in all source files are updated to GPL
2. Check that build systems and package configurations reference correct
license
3. Ensure documentation accurately reflects the GPL license terms
4. Confirm all contributors are aware of the license change
5. Validate that third-party dependencies remain compatible with GPL

chore: 将许可证从LGPL更改为GPL

将项目许可证从LGPL-3.0-or-later更改为GPL-3.0-or-later
更新LICENSE文件内容从LGPL到GPL版本3
修改README.md和README.zh_CN.md以反映许可证变更
更新debian/copyright文件以引用GPL-3+而不是LGPL-3+
此变更使项目符合GPL许可要求，并确保所有项目文件使用一致的许可证

Influence:
1. 验证所有源文件中的许可证头部已更新为GPL
2. 检查构建系统和包配置是否引用正确的许可证
3. 确保文档准确反映GPL许可证条款
4. 确认所有贡献者知晓许可证变更
5. 验证第三方依赖项与GPL保持兼容

Author: mhduiy