feat: 为 Windows 依赖脚本添加网络代理配置支持

在脚本开头提供代理配置示例，取消注释即可生效。
支持 HTTP/HTTPS/SOCKS5 代理及认证代理。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/setup_deps_windows.ps1

@@ -5,6 +5,30 @@
 # ============================================================================
 $ErrorActionPreference = "Stop"
 
+# ============================================================================
+# 网络代理配置（如需通过代理下载，请取消注释并修改）
+# ============================================================================
+# 示例 1：HTTP 代理（最常见）
+# $env:HTTPS_PROXY = "http://127.0.0.1:7890"
+# $env:HTTP_PROXY  = "http://127.0.0.1:7890"
+
+# 示例 2：SOCKS5 代理
+# $env:HTTPS_PROXY = "socks5://127.0.0.1:7890"
+# $env:HTTP_PROXY  = "socks5://127.0.0.1:7890"
+
+# 示例 3：需要认证的代理
+# $env:HTTPS_PROXY = "http://username:password@proxy.example.com:8080"
+
+# 如果设置了代理，让 .NET WebClient 也使用它
+if ($env:HTTPS_PROXY -or $env:HTTP_PROXY) {
+    $ProxyUrl = $env:HTTPS_PROXY ?? $env:HTTP_PROXY
+    Write-Host "[INFO] 使用代理: $ProxyUrl" -ForegroundColor Yellow
+    $ProxyUri = New-Object System.Uri($ProxyUrl)
+    [System.Net.WebRequest]::DefaultWebProxy = New-Object System.Net.WebProxy($ProxyUri)
+    [System.Net.WebRequest]::DefaultWebProxy.Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials
+}
+# ============================================================================
+
 # 项目根目录
 $ProjectRoot = Split-Path $PSScriptRoot -Parent
 $ThirdParty = Join-Path $ProjectRoot "third_party"
@@ -95,6 +119,10 @@ if ((Test-Path (Join-Path $OnnxWinDir "lib\onnxruntime.lib")) -or
         [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
         $client = New-Object System.Net.WebClient
         $client.Headers.Add("User-Agent", "PowerShell")
+        # 如果配置了代理，让 WebClient 也使用
+        if ([System.Net.WebRequest]::DefaultWebProxy -ne $null) {
+            $client.Proxy = [System.Net.WebRequest]::DefaultWebProxy
+        }
         $client.DownloadFile($ZipUrl, $ZipPath)
         Write-Host "[OK] 下载完成" -ForegroundColor Green
     } catch {