fix: reduce config hot-reload interval 60->10 cycles (~2-3min); already pushed strategy thresholds

backend/signal_engine.py

@@ -1472,8 +1472,8 @@ def main():
                 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")
-            # 每60轮(约15分钟)热加载配置，不需要重启
-            if cycle % 60 == 0:
+            # 每10轮(约2-3分钟)热加载配置，不需要重启
+            if cycle % 10 == 0:
                 old_strategies = list(PAPER_ENABLED_STRATEGIES)
                 load_paper_config()
                 strategy_configs = load_strategy_configs()  # A1: 热重载权重/阈值/TP/SL