feat(codex-skill): add windows install script

Add a PowerShell installer for the bundled Codex skill so Windows users can install it without relying on bash. Update the English and Chinese README instructions to document the PowerShell command alongside the existing shell installer.

README.md

@@ -220,6 +220,12 @@ git clone https://github.com/HKUDS/CLI-Anything.git
 bash CLI-Anything/codex-skill/scripts/install.sh
 ```
 
+On Windows PowerShell, use:
+
+```powershell
+.\CLI-Anything\codex-skill\scripts\install.ps1
+```
+
 This installs the skill to `$CODEX_HOME/skills/cli-anything` (or `~/.codex/skills/cli-anything` if `CODEX_HOME` is unset).
 
 Restart Codex after installation so it is discovered.

README_CN.md

@@ -220,6 +220,12 @@ git clone https://github.com/HKUDS/CLI-Anything.git
 bash CLI-Anything/codex-skill/scripts/install.sh
 ```
 
+在 Windows PowerShell 中，可以使用：
+
+```powershell
+.\CLI-Anything\codex-skill\scripts\install.ps1
+```
+
 脚本会把 skill 安装到 `$CODEX_HOME/skills/cli-anything`；如果没有设置 `CODEX_HOME`，则默认安装到 `~/.codex/skills/cli-anything`。
 
 安装后重启 Codex，让它重新发现这个 skill。

codex-skill/scripts/install.ps1

@@ -0,0 +1,26 @@
+$ErrorActionPreference = "Stop"
+
+$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+$skillDir = Split-Path -Parent $scriptDir
+
+$codexHome = if ($env:CODEX_HOME) {
+    $env:CODEX_HOME
+} elseif ($env:USERPROFILE) {
+    Join-Path $env:USERPROFILE ".codex"
+} else {
+    throw "CODEX_HOME is not set and USERPROFILE is unavailable."
+}
+
+$destRoot = Join-Path $codexHome "skills"
+$destDir = Join-Path $destRoot "cli-anything"
+
+New-Item -ItemType Directory -Path $destRoot -Force | Out-Null
+
+if (Test-Path $destDir) {
+    Write-Error "Refusing to overwrite existing skill: $destDir`nRemove it manually if you want to reinstall."
+}
+
+Copy-Item -Path $skillDir -Destination $destDir -Recurse
+
+Write-Host "Installed Codex skill to: $destDir"
+Write-Host "Restart Codex to pick up the new skill."