Extend backtest period from 70 to 90 days (~3 months)

cat-fly/auto_report_long_only_t1.py

@@ -283,12 +283,12 @@ def main():
     initial_capital = 1000000
     
     # 1. 获取数据
-    print("\n📊 步骤1: 获取近2个月数据...")
+    print("\n📊 步骤1: 获取近3个月数据...")
     try:
         config_manager = ConfigManager('config.json')
         fetcher = IntradayDataFetcher(config_manager)
         end_date = datetime.now()
-        start_date = end_date - timedelta(days=70)  # 2个月+10天缓冲
+        start_date = end_date - timedelta(days=90)  # 近3个月
         raw_data = fetcher.fetch_30min_data(start_date, end_date)
         
         if raw_data is None or len(raw_data) == 0: