Remove CLS collection and support a full news AI reset

backend/src/alphapulse/trading/engine.py

@@ -1,4 +1,4 @@
-"""模拟盘交易进程：同步账户快照、执行器对账、调度分析、记录新闻信号。
+"""模拟盘交易进程：同步账户快照、执行器对账、调度分析。
 
 用法：python -m alphapulse.trading.engine
 """
@@ -13,7 +13,6 @@ from alphapulse.core.db import SessionLocal
 from alphapulse.models import TradingAnalysis, TradingSymbol
 from alphapulse.trading.analyst import run_analysis
 from alphapulse.trading.executor import executor_loop
-from alphapulse.trading.news_signals import news_signal_loop
 from alphapulse.trading.schedule import routine_requests
 from alphapulse.trading.snapshot import SnapshotError, read_snapshot, require_fresh_snapshot, snapshot_loop
 
@@ -80,7 +79,6 @@ async def main() -> None:
         tg.create_task(snapshot_loop())
         tg.create_task(executor_loop())
         tg.create_task(analysis_loop())
-        tg.create_task(news_signal_loop())
 
 
 if __name__ == "__main__":