Fix: Modern Terminal blank under SYSTEM; precise reason in info list

build.ps1

@@ -43,6 +43,18 @@ foreach ($pattern in $msBuildPaths) {
     }
 }
 
+# 兜底：默认路径找不到（例如 VS 装在 D 盘）时，用 vswhere 反查。
+# vswhere.exe 由 VS Installer 维护，固定在 %ProgramFiles(x86)% 下，与 VS 本体盘符无关。
+if (-not $msBuild) {
+    $vswhere = "${env:ProgramFiles(x86)}\Microsoft Visual Studio\Installer\vswhere.exe"
+    if (Test-Path $vswhere) {
+        $found = & $vswhere -latest -products * -requires Microsoft.Component.MSBuild `
+                            -find "MSBuild\**\Bin\MSBuild.exe" 2>$null |
+                 Select-Object -First 1
+        if ($found) { $msBuild = $found }
+    }
+}
+
 if (-not $msBuild) {
     Write-Host "ERROR: MSBuild not found." -ForegroundColor Red
     Write-Host ""