build(deps): bump Mapster to 10.0.12

[dependabot]

Updated Mapster from 10.0.11 to 10.0.12.

Release notes

Sourced from Mapster's releases.

10.0.12

What's Changed

• Fix/1007 ignoreif record property by @​alihut in Fix/1007 ignoreif record property MapsterMapper/Mapster#1008

New Contributors

• @​alihut made their first contribution in Fix/1007 ignoreif record property MapsterMapper/Mapster#1008

Full Changelog: MapsterMapper/Mapster@v10.0.11...v10.0.12

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[philfanzhou]

需要修改后再合并：

1. Directory.Packages.props 将 Mapster 升级到 10.0.12，但 docs/development/Testing.md:18 仍明确写着 Mapster 10.0.11。合并当前差异会使英文开发文档与实际依赖版本不一致；请在本 PR 中同步该版本说明。
2. PR 标题 Bump the dotnet-dependencies group with 1 update 不符合仓库要求的英文 conventional commit 格式；请改为类似 build(deps): bump Mapster to 10.0.12。

其余审查未发现 Mapster 补丁内容、调用面或合并冲突方面的阻塞问题。

[philfanzhou]

已完成 requested changes：

• 将 PR 标题更新为 build(deps): bump Mapster to 10.0.12。
• 将 docs/development/Testing.md 中的 Mapster 版本同步为 10.0.12。
• 合并最新 main，消除分支落后状态。

本地验证：

• dotnet restore Lexarbor.sln：通过。
• dotnet build Lexarbor.sln --configuration Release --no-restore：通过，0 warning / 0 error。
• dotnet test Lexarbor.sln --configuration Release --no-build --no-restore：通过，212 passed / 0 failed / 0 skipped。
• 未运行前端与容器验证：本 PR 未修改前端、容器、持久化或启动脚本。

[philfanzhou]

两项 requested changes 均已完成，最终 diff 仅包含 Mapster 补丁升级及对应英文测试文档版本同步；本地后端验证与全部 GitHub checks 均通过。批准合并。