Add python27.dll copy logic for Python 2.7 packaging

Copy python27.dll from Windows system directory to package directory
for Python 2.7.18 to ensure portable distribution works correctly.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: naizhao

.github/workflows/package_python_install.yml

@@ -443,6 +443,24 @@ jobs:
           Get-ChildItem -Path $installDir -Recurse -Depth 1 | Out-String
           $itemCount = (Get-ChildItem -Path $installDir).Count
           if ($itemCount -eq 0) { Write-Error "Installation directory '$installDir' is empty. Cannot package."; exit 1 }
+          # Copy python27.dll for Python 2.7 if needed
+          $version = "${{ inputs.python_version }}"
+          if ($version -eq '2.7.18') {
+            $python27DllSource = "C:\Windows\System32\python27.dll"
+            $python27DllDest = Join-Path -Path $installDir -ChildPath "python27.dll"
+            if (Test-Path $python27DllSource) {
+              Write-Host "Copying python27.dll from '$python27DllSource' to '$python27DllDest'..."
+              try {
+                Copy-Item -Path $python27DllSource -Destination $python27DllDest -Force -ErrorAction Stop
+                Write-Host "python27.dll copied successfully."
+              } catch {
+                Write-Warning "Failed to copy python27.dll: $_. The package may not work properly on systems without Python 2.7 installed."
+              }
+            } else {
+              Write-Warning "python27.dll not found at '$python27DllSource'. The package may not work properly on systems without Python 2.7 installed."
+            }
+          }
+
           Write-Host "Compressing installed Python from '$installDir' to '$destinationPath'..."
           $parentDir = Split-Path $installDir -Parent; $dirName = Split-Path $installDir -Leaf
           Push-Location $parentDir