feat: Alpha Vantage备选数据源配置

- Alpha Vantage API Key: W5PTA2J5OB16W02L
- 数据源优先级: Yahoo Finance → Alpha Vantage
- 当Yahoo Finance限流时自动fallback到Alpha Vantage

web_app.py

@@ -530,6 +530,7 @@ def run_analysis(task_id, ticker, date):
         # 设置环境变量
         os.environ['OPENAI_COMPATIBLE_API_KEY'] = 'tp-ce6eaqg1gh1uev46i4oexh4sahloyfo2hfpxuc2n9m7yl9dd'
         os.environ['FRED_API_KEY'] = '825283926dd016ea66e96cc919e047da'
+        os.environ['ALPHA_VANTAGE_API_KEY'] = 'W5PTA2J5OB16W02L'
         
         log(f'📊 开始分析 {ticker} ({date})')
         log(f'🤖 模型: MiMo-v2.5-pro')
@@ -546,6 +547,16 @@ def run_analysis(task_id, ticker, date):
         config['max_debate_rounds'] = 1
         config['max_risk_discuss_rounds'] = 1
         
+        # 配置数据源：Yahoo Finance优先，Alpha Vantage作为备选
+        config['data_vendors'] = {
+            'core_stock_apis': 'yfinance,alpha_vantage',
+            'technical_indicators': 'yfinance,alpha_vantage',
+            'fundamental_data': 'yfinance,alpha_vantage',
+            'news_data': 'yfinance,alpha_vantage',
+            'macro_data': 'fred',
+            'prediction_markets': 'polymarket',
+        }
+        
         log('🔧 配置完成，启动分析引擎...')
         
         ta = TradingAgentsGraph(debug=True, config=config)