Isolate CTP in worker process and improve strategy roll UX.

Split vn.py into qihuo-ctp worker with IPC client bridge, keep CTP connected during breaks with cached account fallback, speed up strategy page loads, and allow off-session breakout roll submissions.

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

market_sessions.py

@@ -277,9 +277,11 @@ def should_keep_ctp_connected(
     minutes_before: int = 30,
     minutes_after: int = 30,
 ) -> bool:
-    """是否处于应连接 CTP 的窗口：交易时段 + 盘前 + 盘后宽限。"""
+    """是否处于应连接 CTP 的窗口：交易时段 + 小节/午间休盘 + 盘前 + 盘后宽限。"""
     if is_trading_session(now):
         return True
+    if is_morning_break(now) or is_lunch_break(now):
+        return True
     if in_postmarket_grace_window(now, minutes_after=minutes_after):
         return True
     return in_premarket_connect_window(now, minutes_before=minutes_before)