Fix empty recommend list and CTP premarket auto-connect.

Correct main_code order in product refresh, refresh on CTP connect, and limit reconnect to trading or premarket windows.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/INDEX.md

@@ -36,9 +36,10 @@
 | 文档 | 说明 |
 |------|------|
 | [TRADING.md](./TRADING.md) | 可开仓品种、计仓、SimNow/实盘 |
+| [SIMNOW.md](./SIMNOW.md) | SimNow 仿真注册与接入 |
+| [CTP_LIVE.md](./CTP_LIVE.md) | **期货公司实盘 CTP** 与开平仓对比 |
 | [DEPLOY.md](./DEPLOY.md) | 部署说明 |
 | [BACKUP.md](./BACKUP.md) | 数据备份与恢复 |
-| [SIMNOW.md](./SIMNOW.md) | SimNow 模拟盘 |
 
 ---
 
@@ -53,3 +54,4 @@
 | AI 何时分析、推什么 | [AI.md](./AI.md) |
 | 手动平仓后为何冻结 | [RISK.md#冷静期与日冻结](./RISK.md) |
 | 移动保本怎么抬止损 | [ORDER_MONITOR.md#移动保本](./ORDER_MONITOR.md) |
+| 实盘 CTP 怎么接、和 SimNow 开平是否一样 | [CTP_LIVE.md](./CTP_LIVE.md) |