feat: 统一代理配置管理，支持IPv4/IPv6协议族选择

- 新增统一代理工具 ProxyHelper，支持 SOCKS5/HTTP/HTTPS 代理
- 添加 IPv4/IPv6 协议族配置选项，默认使用 IPv4 确保兼容性
- 移除 OpenAI 路由中硬编码的 family: 4 限制
- 统一 8 个服务文件中的代理创建逻辑，避免重复维护
- 支持 OAuth 和 token 交换过程中的代理使用
- 新增配置项：PROXY_USE_IPV4（默认 true）
- 向后兼容：现有配置无需手动更新

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/routes/admin.js

@@ -18,8 +18,7 @@ const crypto = require('crypto')
 const fs = require('fs')
 const path = require('path')
 const config = require('../../config/config')
-const { SocksProxyAgent } = require('socks-proxy-agent')
-const { HttpsProxyAgent } = require('https-proxy-agent')
+const ProxyHelper = require('../utils/proxyHelper')
 
 const router = express.Router()
 
@@ -4649,19 +4648,10 @@ router.post('/openai-accounts/exchange-code', authenticateAdmin, async (req, res
       }
     }
 
-    if (sessionData.proxy) {
-      const { type, host, port, username, password } = sessionData.proxy
-      if (type === 'socks5') {
-        // SOCKS5 代理
-        const auth = username && password ? `${username}:${password}@` : ''
-        const socksUrl = `socks5://${auth}${host}:${port}`
-        axiosConfig.httpsAgent = new SocksProxyAgent(socksUrl)
-      } else if (type === 'http' || type === 'https') {
-        // HTTP/HTTPS 代理
-        const auth = username && password ? `${username}:${password}@` : ''
-        const proxyUrl = `${type}://${auth}${host}:${port}`
-        axiosConfig.httpsAgent = new HttpsProxyAgent(proxyUrl)
-      }
+    // 配置代理（如果有）
+    const proxyAgent = ProxyHelper.createProxyAgent(sessionData.proxy)
+    if (proxyAgent) {
+      axiosConfig.httpsAgent = proxyAgent
     }
 
     // 交换 authorization code 获取 tokens

src/routes/openaiRoutes.js

@@ -8,32 +8,11 @@ const unifiedOpenAIScheduler = require('../services/unifiedOpenAIScheduler')
 const openaiAccountService = require('../services/openaiAccountService')
 const apiKeyService = require('../services/apiKeyService')
 const crypto = require('crypto')
-const { SocksProxyAgent } = require('socks-proxy-agent')
-const { HttpsProxyAgent } = require('https-proxy-agent')
+const ProxyHelper = require('../utils/proxyHelper')
 
-// 创建代理 Agent
+// 创建代理 Agent（使用统一的代理工具）
 function createProxyAgent(proxy) {
-  if (!proxy) {
-    return null
-  }
-
-  try {
-    if (proxy.type === 'socks5') {
-      const auth = proxy.username && proxy.password ? `${proxy.username}:${proxy.password}@` : ''
-      const socksUrl = `socks5://${auth}${proxy.host}:${proxy.port}`
-      return new SocksProxyAgent(socksUrl, {
-        family: 4
-      })
-    } else if (proxy.type === 'http' || proxy.type === 'https') {
-      const auth = proxy.username && proxy.password ? `${proxy.username}:${proxy.password}@` : ''
-      const proxyUrl = `${proxy.type}://${auth}${proxy.host}:${proxy.port}`
-      return new HttpsProxyAgent(proxyUrl)
-    }
-  } catch (error) {
-    logger.warn('Failed to create proxy agent:', error)
-  }
-
-  return null
+  return ProxyHelper.createProxyAgent(proxy)
 }
 
 // 使用统一调度器选择 OpenAI 账户
@@ -149,11 +128,13 @@ router.post('/responses', authenticateApiKey, async (req, res) => {
     }
 
     // 使用调度器选择账户
-    const { accessToken, accountId, accountName, proxy, account } = await getOpenAIAuthToken(
-      apiKeyData,
-      sessionId,
-      requestedModel
-    )
+    const {
+      accessToken,
+      accountId,
+      accountName: _accountName,
+      proxy,
+      account
+    } = await getOpenAIAuthToken(apiKeyData, sessionId, requestedModel)
     // 基于白名单构造上游所需的请求头，确保键为小写且值受控
     const incoming = req.headers || {}