Move Qt and runtime dependency deployment into CMake POST_BUILD steps

[CodeJhF]

概述

将 Qt、ffmovie、Sparkle 等运行时依赖的部署从打包脚本移入 CMake POST_BUILD 步骤，使开发者在本地构建后即可直接运行/调试，无需手动执行打包脚本。

主要变更

CMake 部署自动化

• exporter/CMakeLists.txt: PAGExporter 构建后自动部署 Qt frameworks、libffmovie.dylib 并设置 rpath
• viewer/CMakeLists.txt: PAGViewer 构建后自动打包为 macOS app bundle，部署 Qt、Sparkle、ffmovie 等依赖；Windows 平台同步支持 windeployqt

打包脚本重构 (build_mac.sh)

• 新增 mergeUniversalBundle 函数，统一处理 app/plugin bundle 的 universal binary 合并
• cleanAbsoluteRpaths 改用临时文件避免子 shell 问题
• Qt 依赖统一收敛到 PAGExporter plugin bundle 内，PAGViewer 通过 qt.conf 的相对路径引用
• 移除了对已删除脚本 (copy_qt_resource.sh / replace_qt_path.sh) 的依赖

PAGExporter QML 路径改进

• 使用 dladdr 动态获取插件自身路径，推导出相对 Resources/qml 路径
• 不再依赖全局共享目录 /Library/Application Support/PAGExporter/

清理

• 删除 copy_qt_resource.sh、replace_qt_path.sh（不再需要）
• 移除 PluginInstaller::CopyQtResource 方法及其调用

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.57%. Comparing base (f1599bd) to head (7e51bdd).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3506      +/-   ##
==========================================
+ Coverage   80.33%   80.57%   +0.23%     
==========================================
  Files         590      620      +30     
  Lines       63768    67021    +3253     
  Branches    19261    19885     +624     
==========================================
+ Hits        51231    54005    +2774     
- Misses       8786     9082     +296     
- Partials     3751     3934     +183     

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