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/examples/multi_indicator_composite.py

@@ -2,12 +2,12 @@
 # 多指标组合策略 (均线+RSI+MACD)
 # Multi-Indicator Composite Strategy
 # ============================================================
-# 
+#
 # 使用方法:
 # 1. 可配置均线周期、RSI阈值等参数
 # 2. 买入条件: RSI超卖 + MACD金叉 + 成交量放大
 # 3. 卖出条件: RSI超买 或 MACD死叉
-# 
+#
 # ============================================================
 
 # === 参数声明 ===
@@ -78,7 +78,7 @@ buy = ma_golden | rsi_buy  # 均线金叉 或 RSI超卖
 
 if use_macd:
     buy = buy & (macd > macd_signal)  # 需要MACD向上
-    
+
 if use_volume:
     buy = buy & volume_up  # 需要成交量放大