feat(codex): добавлен proxy launcher для GUI

- Зачем:
  - нужен удобный запуск Codex GUI с proxy-окружением Windows и WSL.
- Что:
  - добавлен PowerShell launcher, выставляющий proxy-переменные и WSLENV.
  - добавлен chezmoi-скрипт для Start Menu ярлыка Codex Proxy.
  - обновлена документация по использованию Codex GUI через прокси.
- Проверка:
  - git diff --cached --check.
  - запуск launcher и повторный запуск shortcut-скрипта.

chezmoi/.chezmoiscripts/run_30-create-codex-proxy-shortcut.ps1

@@ -0,0 +1,90 @@
+$ErrorActionPreference = 'Stop'
+
+if (-not ($IsWindows -or $PSVersionTable.PSEdition -eq 'Desktop')) {
+    return
+}
+
+$LauncherPath = Join-Path $HOME '.local\bin\start-codex-proxy.ps1'
+$ProgramsPath = [Environment]::GetFolderPath('Programs')
+if ([string]::IsNullOrWhiteSpace($ProgramsPath)) {
+    Write-Warning 'Start Menu Programs folder was not found.'
+    return
+}
+
+$ShortcutPath = Join-Path $ProgramsPath 'Codex Proxy.lnk'
+$PwshCommand = Get-Command pwsh -ErrorAction SilentlyContinue
+if ($null -ne $PwshCommand) {
+    $TargetPath = $PwshCommand.Source
+} else {
+    $TargetPath = 'pwsh.exe'
+}
+
+$Arguments = "-NoLogo -NoProfile -ExecutionPolicy Bypass -File `"$LauncherPath`""
+$WorkingDirectory = $env:USERPROFILE
+$IconLocation = "$TargetPath,0"
+
+function Get-CodexExecutable {
+    $Package = Get-AppxPackage -Name 'OpenAI.Codex' -ErrorAction SilentlyContinue |
+        Select-Object -First 1
+
+    if ($null -eq $Package) {
+        return $null
+    }
+
+    try {
+        $Manifest = Get-AppxPackageManifest $Package
+        $Application = @($Manifest.Package.Applications.Application) | Select-Object -First 1
+        if ($null -eq $Application -or [string]::IsNullOrWhiteSpace($Application.Executable)) {
+            return $null
+        }
+
+        $Executable = Join-Path $Package.InstallLocation ([string]$Application.Executable)
+        if (Test-Path -LiteralPath $Executable) {
+            return $Executable
+        }
+    }
+    catch {
+        return $null
+    }
+
+    return $null
+}
+
+$CodexExecutable = Get-CodexExecutable
+if ($null -ne $CodexExecutable) {
+    $IconLocation = "$CodexExecutable,0"
+}
+
+New-Item -ItemType Directory -Path (Split-Path -Parent $ShortcutPath) -Force | Out-Null
+
+$Shell = New-Object -ComObject WScript.Shell
+$Shortcut = $Shell.CreateShortcut($ShortcutPath)
+
+$Changed = $false
+if ($Shortcut.TargetPath -ne $TargetPath) {
+    $Shortcut.TargetPath = $TargetPath
+    $Changed = $true
+}
+if ($Shortcut.Arguments -ne $Arguments) {
+    $Shortcut.Arguments = $Arguments
+    $Changed = $true
+}
+if ($Shortcut.WorkingDirectory -ne $WorkingDirectory) {
+    $Shortcut.WorkingDirectory = $WorkingDirectory
+    $Changed = $true
+}
+if ($Shortcut.IconLocation -ne $IconLocation) {
+    $Shortcut.IconLocation = $IconLocation
+    $Changed = $true
+}
+if ($Shortcut.Description -ne 'Launch Codex with hproxy.local proxy environment') {
+    $Shortcut.Description = 'Launch Codex with hproxy.local proxy environment'
+    $Changed = $true
+}
+
+if ($Changed -or -not (Test-Path -LiteralPath $ShortcutPath)) {
+    $Shortcut.Save()
+    Write-Host "Codex Proxy shortcut: updated $ShortcutPath"
+} else {
+    Write-Host 'Codex Proxy shortcut: already up to date.'
+}