Remove deprecated modules and files related to the backtesting framework, including backtest.py, cli.py, config.py, data.py, intrabar.py, logging_utils.py, market_costs.py, metrics.py, trade.py, and supertrend indicators. Introduce a new structure for the backtesting engine with improved organization and functionality, including a CLI handler, data manager, and reporting capabilities. Update dependencies in pyproject.toml to support the new architecture.

main.py

@@ -0,0 +1,10 @@
+"""
+Lowkey Backtest CLI - VectorBT Edition
+
+A backtesting framework supporting multiple market types (spot, perpetual)
+with realistic trading simulation including leverage, funding, and shorts.
+"""
+from engine.cli import main
+
+if __name__ == "__main__":
+    main()