refactor: Claude Code 安装方式从官方原生脚本改为 npm install

国内用户无法访问 claude.ai/install.sh，统一三个工具的安装路径：
- 移除 setup.sh/ps1 中 Claude Code 的特殊安装分支
- ClaudeCode 独立脚本添加 Node.js/fnm 检测安装函数链
- 三个工具均使用 npm install -g 安装 (需要 Node.js >= 20)
- 更新 CLAUDE.md 和文档中的安装说明

setup-claude-code.ps1

@@ -31,6 +31,7 @@ $ClaudeConfigDir = "$env:USERPROFILE\.claude"
 $ClaudeSettingsFile = "$ClaudeConfigDir\settings.json"
 $ToolCommand = "claude"
 $ToolName = "Claude Code"
+$ToolPackage = "@anthropic-ai/claude-code"
 
 # ========== 工具函数 ==========
 function Test-Command {
@@ -80,14 +81,138 @@ function Write-Error {
     Write-Host " $Message"
 }
 
-function Install-Tool {
-    Write-Info "使用官方安装脚本安装 $ToolName..."
-    Write-Host "  执行: irm https://claude.ai/install.ps1 | iex" -ForegroundColor Gray
+# ========== Node.js 环境检测 ==========
+function Get-NodeVersion {
+    if (Test-Command "node") {
+        try {
+            $versionStr = (& node --version 2>$null) -replace 'v', ''
+            $major = [int]($versionStr -split '\.')[0]
+            return @{ Version = $versionStr; Major = $major }
+        }
+        catch { }
+    }
+    return $null
+}
+
+function Install-Fnm {
+    Write-Host ""
+    Write-Info "正在安装 fnm (Fast Node Manager)..."
 
     try {
-        Invoke-Expression "& { $(Invoke-RestMethod https://claude.ai/install.ps1) }"
+        if (Test-Command "winget") {
+            Write-Info "使用 winget 安装 fnm..."
+            & winget install Schniz.fnm -e --accept-source-agreements --accept-package-agreements
+        }
+        else {
+            Write-Info "使用 PowerShell 脚本安装 fnm..."
+            Invoke-Expression "& { $(Invoke-RestMethod https://fnm.vercel.app/install.ps1) }"
+        }
+
         Refresh-Path
 
+        if (Test-Command "fnm") {
+            Write-Success "fnm 安装成功!"
+            $fnmEnv = & fnm env --use-on-cd 2>$null
+            if ($fnmEnv) {
+                $fnmEnv | Out-String | Invoke-Expression
+            }
+            return $true
+        }
+        else {
+            Write-Warning "fnm 可能已安装，但需要重新打开终端才能生效"
+            Write-Info "请重新打开 PowerShell 后再运行此脚本"
+            return $false
+        }
+    }
+    catch {
+        Write-Error "fnm 安装失败: $($_.Exception.Message)"
+        return $false
+    }
+}
+
+function Install-NodeWithFnm {
+    Write-Info "使用 fnm 安装 Node.js 24.x..."
+
+    try {
+        & fnm install 24
+        & fnm use 24
+        & fnm default 24
+        Refresh-Path
+
+        if (Test-Command "node") {
+            $nodeInfo = Get-NodeVersion
+            Write-Success "Node.js v$($nodeInfo.Version) 安装成功!"
+            return $true
+        }
+        else {
+            Write-Warning "Node.js 可能已安装，但需要重新打开终端才能生效"
+            return $false
+        }
+    }
+    catch {
+        Write-Error "Node.js 安装失败: $($_.Exception.Message)"
+        return $false
+    }
+}
+
+function Ensure-NodeEnvironment {
+    $nodeInfo = Get-NodeVersion
+
+    if ($nodeInfo) {
+        Write-Info "检测到 Node.js v$($nodeInfo.Version)"
+
+        if ($nodeInfo.Major -lt 20) {
+            Write-Warning "Node.js 版本过低 (需要 >= 20.x)"
+
+            $upgrade = Read-Host "是否使用 fnm 安装 Node.js 24.x? (Y/n)"
+            if ($upgrade -eq "n" -or $upgrade -eq "N") {
+                Write-Error "Node.js 版本不满足要求，请手动升级后重试"
+                return $false
+            }
+
+            if (-not (Test-Command "fnm")) {
+                if (-not (Install-Fnm)) { return $false }
+            }
+
+            return Install-NodeWithFnm
+        }
+
+        return $true
+    }
+
+    Write-Warning "未检测到 Node.js"
+    Write-Info "将使用 fnm 安装 Node.js 24.x"
+
+    $install = Read-Host "是否继续? (Y/n)"
+    if ($install -eq "n" -or $install -eq "N") {
+        return $false
+    }
+
+    if (-not (Test-Command "fnm")) {
+        if (-not (Install-Fnm)) { return $false }
+    }
+
+    return Install-NodeWithFnm
+}
+
+function Install-Tool {
+    if (-not (Ensure-NodeEnvironment)) {
+        return $false
+    }
+
+    Write-Info "使用 npm 安装 $ToolName..."
+    Write-Host "  执行: npm install -g $ToolPackage" -ForegroundColor Gray
+
+    try {
+        Invoke-Expression "npm install -g $ToolPackage"
+        $exitCode = $LASTEXITCODE
+        Refresh-Path
+
+        if ($exitCode -ne 0) {
+            Write-Error "安装命令返回错误码: $exitCode"
+            return $false
+        }
+
         if (Test-Command $ToolCommand) {
             Write-Success "$ToolName 安装成功!"
             return $true