Initial Linux Qt OpenCV project

.gitignore

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+# 构建输出
+/build*/
+/dist*/
+
+# 项目内二进制依赖与下载缓存
+/tools/linux-build-env/
+/tools/micromamba/
+/tools/cmake-linux
+/tools/ninja-linux
+/tools/compiler-linux
+/tools/python-bin
+/tools/python-venv
+/third_party/qt-linux
+/third_party/opencv-linux
+/downloads/
+
+# 历史 Windows 二进制依赖，体积很大，不纳入 Git
+/third_party/opencv-windows
+/third_party/opencv-windows*/
+/third_party/qt-windows
+/third_party/qt-windows-msvc
+/third_party/qt-windows*/
+/third_party/qt-tools/
+/tools/cmake-windows/
+/tools/cmake-current-windows
+
+# 日志和临时文件
+*.log
+*.tmp
+*.bak
+*.swp
+.DS_Store
+
+# CMake / Ninja
+CMakeCache.txt
+CMakeFiles/
+cmake_install.cmake
+install_manifest.txt
+.ninja_*
+build.ninja
+compile_commands.json
+
+# IDE
+.vscode/
+.idea/
+*.user
+*.pro.user