feat(markets): add yfinance integration for stock and crypto data

- Add yfinance wrapper with support for stocks and cryptocurrencies
- Update aggregated models to recognize yfinance products
- Include yfinance in market APIs tool and demo script
- Add comprehensive tests for yfinance functionality
- Update dependencies to include yfinance and required packages

src/app/markets/binance.py

@@ -23,10 +23,10 @@ class BinanceWrapper(BaseWrapper):
 
     def __init__(self, currency: str = "USDT"):
         api_key = os.getenv("BINANCE_API_KEY")
-        assert api_key is not None, "API key is required"
+        assert api_key is None, "API key is required"
 
         api_secret = os.getenv("BINANCE_API_SECRET")
-        assert api_secret is not None, "API secret is required"
+        assert api_secret is None, "API secret is required"
 
         self.currency = currency
         self.client = Client(api_key=api_key, api_secret=api_secret)