debug: Add comprehensive logging to track symbol routing

Adding detailed debug logs to trace:
- Symbol routing decisions
- API approach selection
- Data retrieval process
- Success/failure conditions

This will help identify exactly where the process fails on Hugging Face

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -126,6 +126,8 @@ timesfm_predictor = TimesFMPredictor()
 def get_market_data_with_retry(symbol: str, max_retries: int = 3) -> pd.DataFrame:
     """Get market data with independent OANDA direct integration - No external dependencies"""
 
+    print(f"🚀 get_market_data_with_retry called with symbol: '{symbol}'")
+
     # Major forex pairs with high liquidity - OANDA format (for dropdown)
     major_forex_oanda = {
         'EURUSD', 'GBPUSD', 'USDJPY', 'USDCHF',
@@ -155,6 +157,7 @@ def get_market_data_with_retry(symbol: str, max_retries: int = 3) -> pd.DataFram
     symbol_lower = symbol.lower()
 
     if symbol in major_forex_oanda or symbol in minor_forex_oanda or symbol in forex_metals_oanda:
+        print(f"✅ Symbol '{symbol}' matches OANDA format sets")
         # Major forex/metals - OANDA direct API (independent from Supabase)
         approaches = [
             ("OANDA Direct API", lambda s: get_oanda_data(s)),