Initial Linux Qt OpenCV project

docs/windows/setup-deps-windows.ps1

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+param(
+    [string]$InstallRoot = "$PSScriptRoot\..\third_party"
+)
+
+$ErrorActionPreference = "Stop"
+
+$InstallRoot = [System.IO.Path]::GetFullPath($InstallRoot)
+New-Item -ItemType Directory -Force -Path $InstallRoot | Out-Null
+
+Write-Host "本脚本不会写入系统目录，只在项目 third_party 下准备依赖。"
+Write-Host "建议方式："
+Write-Host "1. 安装 Qt Online Installer 时，将安装目录选择为：$InstallRoot\qt-sdk"
+Write-Host "2. 安装组件选择 Qt 6.x / MinGW 或 MSVC 版本。"
+Write-Host "3. 将实际 Qt 编译套件目录复制或软链接到：$InstallRoot\qt"
+Write-Host "   例如：$InstallRoot\qt-sdk\6.7.3\mingw_64 -> $InstallRoot\qt"
+Write-Host "4. 下载 OpenCV Windows 预编译包，解压到：$InstallRoot\opencv"
+Write-Host "5. 然后运行：powershell -ExecutionPolicy Bypass -File scripts\build-windows.ps1"
+Write-Host ""
+Write-Host "如使用 vcpkg，也请将 vcpkg clone 到项目 tools/vcpkg，不要装到系统目录。"