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.

docs/STRATEGY_DEV_GUIDE.md

@@ -98,13 +98,13 @@ For charting, you often want to place the signal icon slightly above or below th
 ```python
 # Place Buy marker 0.5% below the Low
 buy_marks = [
-    df['low'].iloc[i] * 0.995 if df['buy'].iloc[i] else None 
+    df['low'].iloc[i] * 0.995 if df['buy'].iloc[i] else None
     for i in range(len(df))
 ]
 
 # Place Sell marker 0.5% above the High
 sell_marks = [
-    df['high'].iloc[i] * 1.005 if df['sell'].iloc[i] else None 
+    df['high'].iloc[i] * 1.005 if df['sell'].iloc[i] else None
     for i in range(len(df))
 ]
 ```
@@ -166,12 +166,12 @@ df['sell'] = sell
 # -----------------------
 # Calculate marker positions
 buy_marks = [
-    df['low'].iloc[i] * 0.995 if buy.iloc[i] else None 
+    df['low'].iloc[i] * 0.995 if buy.iloc[i] else None
     for i in range(len(df))
 ]
 
 sell_marks = [
-    df['high'].iloc[i] * 1.005 if sell.iloc[i] else None 
+    df['high'].iloc[i] * 1.005 if sell.iloc[i] else None
     for i in range(len(df))
 ]