fix: install systemd drop-in under libdir

[felixonmars]

The service drop-in is shipped by the project, so install it next to packaged systemd units instead of under /etc/systemd/system, which is reserved for local administrator overrides.

Summary by Sourcery

Bug Fixes:

• Install the packaged systemd service drop-in under the system unit directory instead of the administrator override directory.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the CMake installation path for the project-provided systemd drop-in so it is installed alongside packaged units under the configured libdir rather than /etc/systemd/system, preserving /etc for local administrator overrides.

File-Level Changes

Change	Details	Files
Relocate the packaged systemd service drop-in from the administrator override directory to the package-managed systemd unit directory.	Change the install destination to ${CMAKE_INSTALL_LIBDIR}/systemd/system/, aligning the drop-in with packaged units and libdir configuration.	deepin-devicemanager-server/deepin-devicecontrol/CMakeLists.txt

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="deepin-devicemanager-server/deepin-devicecontrol/CMakeLists.txt" line_range="136" />
<code_context>
 install(FILES deepin-devicecontrol.service DESTINATION lib/systemd/system/)
 # 添加安全加固策略
-install(DIRECTORY deepin-service-group@.service.d DESTINATION /etc/systemd/system/)
+install(DIRECTORY deepin-service-group@.service.d DESTINATION ${CMAKE_INSTALL_LIBDIR}/systemd/system/)
</code_context>
<issue_to_address>
**🚨 issue (security):** On Debian multiarch builds, `${CMAKE_INSTALL_LIBDIR}` resolves to a path such as `lib/x86_64-linux-gnu`, so the drop-in is installed under `/usr/lib/x86_64-linux-gnu/systemd/system/`, which systemd does not search for unit drop-ins. The packaged `deepin-devicecontrol.service` remains under `/usr/lib/systemd/system/`, so this security-hardening drop-in is never applied.

**Triggers:** When the package is built on a multiarch system or with a non-default library directory.

**Suggested fix:** Install the drop-in beside the unit in `${CMAKE_INSTALL_PREFIX}/lib/systemd/system/`, or otherwise use the systemd vendor-unit directory rather than the architecture-specific library directory.

```suggestion
install(DIRECTORY deepin-service-group@.service.d DESTINATION lib/systemd/system/)
```
</issue_to_address>

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[deepin-ci-robot]

deepin pr auto review

🤖 AI 代码审查报告

总体评分： 100 分 (通过阈值: 70分)

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📊 总体评价

项目	结果
审查结论	代码审查通过
评分详情	未发现安全问题，变更正确将 systemd drop-in 安装目录从 /etc/systemd/system/ 改为 lib/systemd/system/，符合 systemd 打包最佳实践

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🔍 详细分析

1. 语法逻辑 ✅

评价： 优秀 ✅ 通过

潜在问题：
✅ 未发现明显问题

建议： []

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2. 代码质量 ✅

评价： 优秀 ✅ 通过

潜在问题：
✅ 未发现明显问题

建议： []

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3. 代码性能 ✅

评价： 优秀 ✅ 通过

潜在问题：
✅ 未发现明显问题

建议： []

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4. 代码安全 🔒

评价： 优秀 ✅ 通过

🔐 发现 0 个安全漏洞

安全漏洞详情：
✅ 未发现安全漏洞

建议： []

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💡 改进建议代码示例

// 暂无代码示例

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: felixonmars, lzwind

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• debian/deepin/OWNERS

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