ci(build): move Win7 Cargo patch enabling logic to a separate PowerShell script

- Replaced inline script in the build action with a dedicated PowerShell script (`enable-win7-cargo-patches.ps1`) for better organization and maintainability.
- The new script handles the enabling of Win7-specific Cargo patches, including validation of the `ctor` package and updating the Cargo configuration.
- This change improves readability and separation of concerns in the build process.

.github/actions/build-win7/action.yml

@@ -87,19 +87,7 @@ runs:
 
     - name: Enable Win7-only Cargo patches
       shell: pwsh
-      run: |
-        $ErrorActionPreference = "Stop"
-
-        New-Item -ItemType Directory -Force -Path ".cargo" | Out-Null
-        @'
-        [patch.crates-io]
-        webview2-com-sys = { path = "src-tauri/vendor/webview2-com-sys" }
-        windows-core = { path = "src-tauri/vendor/windows-core" }
-        '@ | Set-Content -LiteralPath ".cargo/config.toml" -Encoding UTF8
-
-        cargo metadata --manifest-path src-tauri/Cargo.toml --format-version 1 | Out-Null
-        Write-Host "Enabled Win7-only Cargo patches:"
-        Get-Content -LiteralPath ".cargo/config.toml"
+      run: ./.github/scripts/enable-win7-cargo-patches.ps1
 
     - name: Print build metadata
       shell: pwsh

.github/scripts/enable-win7-cargo-patches.ps1

@@ -0,0 +1,89 @@
+[CmdletBinding()]
+param()
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$knownCtorVersion = "0.8.0"
+$knownCtorMacrosSha256 = "86ec55f4670e68dbd0fb6f400be0374ba14ac9b621ba041561de7dc629e22fcc"
+
+$repositoryRoot = (Resolve-Path (Join-Path $PSScriptRoot "..\..")).Path
+$tauriManifest = Join-Path $repositoryRoot "src-tauri\Cargo.toml"
+$cargoConfigDirectory = Join-Path $repositoryRoot ".cargo"
+$cargoConfigPath = Join-Path $cargoConfigDirectory "config.toml"
+$temporaryRoot = Join-Path ([System.IO.Path]::GetTempPath()) "nyaterm-win7-cargo-patches-$([Guid]::NewGuid())"
+$patchedCtorRoot = Join-Path $temporaryRoot "ctor-$knownCtorVersion"
+
+Push-Location $repositoryRoot
+try {
+  $metadataJson = & cargo metadata --manifest-path $tauriManifest --locked --format-version 1
+  if ($LASTEXITCODE -ne 0) {
+    throw "cargo metadata failed while locating ctor $knownCtorVersion."
+  }
+
+  $metadata = $metadataJson | ConvertFrom-Json
+  $ctorPackages = @($metadata.packages | Where-Object {
+      $_.name -eq "ctor" -and $_.version -eq $knownCtorVersion
+    })
+  if ($ctorPackages.Count -ne 1) {
+    throw "Expected exactly one ctor $knownCtorVersion package, found $($ctorPackages.Count)."
+  }
+
+  $ctorRoot = Split-Path -Parent $ctorPackages[0].manifest_path
+  $ctorMacrosPath = Join-Path $ctorRoot "src\macros\mod.rs"
+  if (!(Test-Path -LiteralPath $ctorMacrosPath -PathType Leaf)) {
+    throw "ctor macros file does not exist: $ctorMacrosPath"
+  }
+
+  $actualCtorMacrosSha256 = (Get-FileHash -LiteralPath $ctorMacrosPath -Algorithm SHA256).Hash.ToLowerInvariant()
+  if ($actualCtorMacrosSha256 -ne $knownCtorMacrosSha256) {
+    throw "Unexpected ctor $knownCtorVersion macros SHA256. Expected $knownCtorMacrosSha256, got $actualCtorMacrosSha256."
+  }
+
+  New-Item -ItemType Directory -Path $temporaryRoot -Force | Out-Null
+  Copy-Item -LiteralPath $ctorRoot -Destination $patchedCtorRoot -Recurse -Force
+
+  $patchedMacrosPath = Join-Path $patchedCtorRoot "src\macros\mod.rs"
+  $patchedMacros = Get-Content -LiteralPath $patchedMacrosPath -Raw
+  $unsupportedVendorCondition = 'target_vendor = "pc"'
+  $replacementCount = ([regex]::Matches($patchedMacros, [regex]::Escape($unsupportedVendorCondition))).Count
+  if ($replacementCount -ne 3) {
+    throw "Expected three Windows vendor checks in ctor $knownCtorVersion, found $replacementCount."
+  }
+
+  # The built-in Win7 targets use target_vendor="win7" but retain the normal
+  # Windows MSVC CRT constructor sections. This is the same compatibility fix
+  # released upstream in ctor 1.0.4, kept on 0.8.0 for Tauri's version range.
+  $patchedMacros = $patchedMacros.Replace($unsupportedVendorCondition, 'target_os = "windows"')
+  Set-Content -LiteralPath $patchedMacrosPath -Value $patchedMacros -Encoding UTF8 -NoNewline
+
+  $cargoCtorPath = $patchedCtorRoot.Replace("\", "/").Replace("'", "''")
+  New-Item -ItemType Directory -Path $cargoConfigDirectory -Force | Out-Null
+  @"
+[patch.crates-io]
+ctor = { path = '$cargoCtorPath' }
+webview2-com-sys = { path = "src-tauri/vendor/webview2-com-sys" }
+windows-core = { path = "src-tauri/vendor/windows-core" }
+"@ | Set-Content -LiteralPath $cargoConfigPath -Encoding UTF8
+
+  $patchedMetadataJson = & cargo metadata --manifest-path $tauriManifest --format-version 1
+  if ($LASTEXITCODE -ne 0) {
+    throw "cargo metadata failed after enabling the Windows 7 Cargo patches."
+  }
+
+  $patchedMetadata = $patchedMetadataJson | ConvertFrom-Json
+  $activeCtorPackages = @($patchedMetadata.packages | Where-Object {
+      $_.name -eq "ctor" -and $_.version -eq $knownCtorVersion -and
+      (Split-Path -Parent $_.manifest_path) -eq $patchedCtorRoot
+    })
+  if ($activeCtorPackages.Count -ne 1) {
+    throw "The patched ctor $knownCtorVersion package was not selected by Cargo."
+  }
+
+  Write-Host "Enabled Win7-only Cargo patches:"
+  Get-Content -LiteralPath $cargoConfigPath
+  Write-Host "Patched ctor source: $patchedCtorRoot"
+}
+finally {
+  Pop-Location
+}