feat: CTP 断线重连、下单卡片优化、手数自动计算

后台每 30s 检测并重连；以损定仓填止损后自动算手数；开仓/平仓按钮并排对齐。

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

install_trading.py

@@ -19,6 +19,7 @@ from position_sizing import (
 )
 from recommend_store import load_recommend_cache, refresh_recommend_cache
 from recommend_stream import recommend_hub, start_recommend_worker
+from ctp_reconnect import start_ctp_reconnect_worker
 from risk.account_risk_lib import (
     assert_can_open,
     get_risk_status,
@@ -918,3 +919,4 @@ def install_trading(app, *, login_required, get_db, get_setting, set_setting, fe
         price_fn=_main_price,
         init_tables_fn=_init_tables,
     )
+    start_ctp_reconnect_worker(get_mode_fn=lambda: get_trading_mode(get_setting))