feat: 添加多模型支持和OpenAI兼容接口

- 新增 Gemini 模型支持和账户管理功能
- 实现 OpenAI 格式到 Claude/Gemini 的请求转换
- 添加自动 token 刷新服务，支持提前刷新策略
- 增强 Web 管理界面，支持 Gemini 账户管理
- 优化 token 显示，添加掩码功能
- 完善日志记录和错误处理

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

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

package.json

@@ -1,7 +1,7 @@
 {
   "name": "claude-relay-service",
   "version": "1.0.0",
-  "description": "Claude Code API relay service with multi-account management and API key authentication",
+  "description": "Claude Code API relay service with multi-account management, OpenAI compatibility, and API key authentication",
   "main": "src/app.js",
   "scripts": {
     "start": "node src/app.js",
@@ -36,6 +36,7 @@
     "cors": "^2.8.5",
     "dotenv": "^16.3.1",
     "express": "^4.18.2",
+    "google-auth-library": "^10.1.0",
     "helmet": "^7.1.0",
     "https-proxy-agent": "^7.0.2",
     "inquirer": "^9.2.15",