Refactor code for improved readability and consistency

- Cleaned up whitespace and formatting in various files including http.py, language.py, logger.py, safe_exec.py, and SQL migration scripts.
- Consolidated import statements and removed unnecessary blank lines.
- Updated logging configuration for better clarity.
- Enhanced the safe execution code with improved error handling and logging.
- Removed commented-out code and unnecessary variables in backfill_zero_trades.py and other scripts.
- Added a pyproject.toml for Ruff and Vulture configuration.
- Introduced requirements-dev.txt for development dependencies.
- Removed commented-out stock entries in init.sql for cleaner migration scripts.

backend_api_python/app/services/ibkr_trading/symbols.py

@@ -4,28 +4,28 @@ Symbol Mapping and Conversion
 Converts QuantDinger system symbols to IB contract format.
 """
 
-from typing import Tuple, Optional
+from typing import Optional, Tuple
 
 
 def normalize_symbol(symbol: str, market_type: str) -> Tuple[str, str, str]:
     """
     Convert system symbol to IB contract parameters.
-    
+
     Args:
         symbol: Symbol code in the system
         market_type: Market type (USStock)
-        
+
     Returns:
         (ib_symbol, exchange, currency)
     """
     symbol = (symbol or "").strip().upper()
     market_type = (market_type or "").strip()
-    
+
     if market_type == "USStock":
         # US stocks: AAPL, TSLA, GOOGL
         # Use SMART routing for best execution
         return symbol, "SMART", "USD"
-    
+
     else:
         # Default to US stock
         return symbol, "SMART", "USD"
@@ -34,15 +34,15 @@ def normalize_symbol(symbol: str, market_type: str) -> Tuple[str, str, str]:
 def parse_symbol(symbol: str) -> Tuple[str, Optional[str]]:
     """
     Parse symbol and auto-detect market type.
-    
+
     Args:
         symbol: Symbol code
-        
+
     Returns:
         (clean_symbol, market_type)
     """
     symbol = (symbol or "").strip().upper()
-    
+
     # Default to US stock
     return symbol, "USStock"
 
@@ -50,11 +50,11 @@ def parse_symbol(symbol: str) -> Tuple[str, Optional[str]]:
 def format_display_symbol(ib_symbol: str, exchange: str) -> str:
     """
     Convert IB contract format back to display format.
-    
+
     Args:
         ib_symbol: IB symbol
         exchange: Exchange code
-        
+
     Returns:
         Display symbol
     """