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>

src/app.js

@@ -16,6 +16,9 @@ const pricingService = require('./services/pricingService');
 const apiRoutes = require('./routes/api');
 const adminRoutes = require('./routes/admin');
 const webRoutes = require('./routes/web');
+const geminiRoutes = require('./routes/geminiRoutes');
+const openaiGeminiRoutes = require('./routes/openaiGeminiRoutes');
+const openaiClaudeRoutes = require('./routes/openaiClaudeRoutes');
 
 // Import middleware
 const { 
@@ -97,6 +100,9 @@ class Application {
       this.app.use('/api', apiRoutes);
       this.app.use('/admin', adminRoutes);
       this.app.use('/web', webRoutes);
+      this.app.use('/gemini', geminiRoutes);
+      this.app.use('/openai/gemini', openaiGeminiRoutes);
+      this.app.use('/openai/claude', openaiClaudeRoutes);
       
       // 🏠 根路径重定向到管理界面
       this.app.get('/', (req, res) => {