chore: update pkg-config include path for tray loader

[18202781743]

1. Change the includedir variable in dde-tray-loader.pc.in
   from @CMAKE_INSTALL_FULL_INCLUDEDIR@/dde-tray-loader to
   @CMAKE_INSTALL_FULL_INCLUDEDIR@/dde-dock
2. This corrects the actual installation directory where the tray plugin
   development headers are placed
3. Ensures pkg-config consumers can successfully locate and include the
   correct header files

Influence:

1. Verify that pkg-config --cflags dde-tray-loader returns the updated
   include path pointing to dde-dock
2. Test building a sample program that uses the tray plugin headers via
   pkg-config
3. Ensure that consumer packages depending on this pc file can compile
   without header resolution errors

chore: 更新托盘加载器的 pkg-config 包含路径

1. 将 dde-tray-loader.pc.in 中的 includedir 变量
   从 @CMAKE_INSTALL_FULL_INCLUDEDIR@/dde-tray-loader 改为
   @CMAKE_INSTALL_FULL_INCLUDEDIR@/dde-dock
2. 修正了托盘插件开发头文件实际安装目录的配置
3. 确保使用 pkg-config 的消费者能够正确定位并引用正确的头文件

Influence:

1. 验证 pkg-config --cflags dde-tray-loader 返回的包含路径指向 dde- dock
2. 测试通过 pkg-config 使用托盘插件头文件构建示例程序的过程
3. 确保依赖此 pc 文件的消费者包能够正常编译，无头文件解析错误

Summary by Sourcery

Bug Fixes:

• Correct the tray loader pkg-config include path so consumers can locate the installed development headers.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the pkg-config template for dde-tray-loader so that the advertised include directory matches the actual dde-dock header installation path, ensuring consumers can find the tray plugin development headers correctly.

File-Level Changes

Change	Details	Files
Correct pkg-config includedir for dde-tray-loader to point to the dde-dock headers directory used at install time.	Update the includedir definition to use @CMAKE_INSTALL_FULL_INCLUDEDIR@/dde-dock instead of @CMAKE_INSTALL_FULL_INCLUDEDIR@/dde-tray-loader so pkg-config --cflags reports the real header path Align the pkg-config metadata with the actual installation layout of tray plugin development headers to avoid header resolution errors for downstream builds	dde-tray-loader.pc.in

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, BLumia

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