feat: 完善 Gemini 功能与 Claude 保持一致

- 添加 Gemini 账户的 schedulable 字段和调度开关 API
- 实现 Gemini 调度器的模型过滤功能
- 完善 Gemini 数据统计，记录 token 使用量
- 修复 Gemini 流式响应的 SSE 解析和 AbortController 支持
- 在教程页面和 README 中添加 Gemini CLI 环境变量说明
- 修复前端 Gemini 账户调度开关限制

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

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

src/routes/geminiRoutes.js

@@ -7,7 +7,7 @@ const { sendGeminiRequest, getAvailableModels } = require('../services/geminiRel
 const crypto = require('crypto');
 const sessionHelper = require('../utils/sessionHelper');
 const unifiedGeminiScheduler = require('../services/unifiedGeminiScheduler');
-const { OAuth2Client } = require('google-auth-library');
+// const { OAuth2Client } = require('google-auth-library'); // OAuth2Client is not used in this file
 
 // 生成会话哈希
 function generateSessionHash(req) {
@@ -108,7 +108,8 @@ router.post('/messages', authenticateApiKey, async (req, res) => {
       proxy: account.proxy,
       apiKeyId: apiKeyData.id,
       signal: abortController.signal,
-      projectId: account.projectId
+      projectId: account.projectId,
+      accountId: account.id
     });
 
     if (stream) {