fix: Respect CMAKE_INSTALL_LIBDIR for module installation and lookup

[hillwoodroc]

This ensures correct installation and runtime lookup on both lib and lib64 based systems.

Log:

• Define CMAKE_INSTALL_FULL_LIBDIR in top-level CMakeLists.txt
• Replace hardcoded 'lib/dde-session-shell/modules' with '${CMAKE_INSTALL_LIBDIR}/dde-session-shell/modules' in all plugin CMakeLists
• Update modules_loader.cpp to use CMAKE_INSTALL_FULL_LIBDIR for locating modules and configs

[deepin-ci-robot]

Hi @hillwoodroc. Thanks for your PR. :smiley:

[deepin-ci-robot]

Hi @hillwoodroc. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: hillwoodroc, yixinshark

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