fix: skip first 3 cycles after cold start to prevent duplicate paper trades

backend/signal_engine.py

@@ -665,6 +665,7 @@ def main():
 
     last_1m_save = {}
     cycle = 0
+    warmup_cycles = 3  # 启动后跳过前3轮（45秒），避免冷启动信号开仓
 
     while True:
         try:
@@ -687,8 +688,8 @@ def main():
 
                 if result.get("signal"):
                     logger.info(f"[{sym}] 🚨 信号: {result['signal']} score={result['score']} price={result['price']:.1f}")
-                    # 模拟盘开仓（需开关开启）
-                    if PAPER_TRADING_ENABLED:
+                    # 模拟盘开仓（需开关开启 + 跳过冷启动）
+                    if PAPER_TRADING_ENABLED and warmup_cycles <= 0:
                         existing_dir = paper_get_active_direction(sym)
                         new_dir = result["signal"]
 
@@ -710,6 +711,10 @@ def main():
                 # 模拟盘持仓检查由paper_monitor.py通过WebSocket实时处理，这里不再检查
 
             cycle += 1
+            if warmup_cycles > 0:
+                warmup_cycles -= 1
+                if warmup_cycles == 0:
+                    logger.info("冷启动保护期结束，模拟盘开仓已启用")
             if cycle % 60 == 0:
                 for sym, state in states.items():
                     logger.info(