fix: resolve lint issues and final integration fixes

- Fix ambiguous variable name in binance_rest.py
- Remove unused volumes variable in volume_profile_strategy.py
- Fix import ordering in backtester main.py and test_metrics.py
- Auto-format all files with ruff

1 files changed, 2 insertions, 2 deletions

diff --git a/services/backtester/tests/test_engine.py b/services/backtester/tests/test_engine.py
index 1a25e1c..6962477 100644
--- a/services/backtester/tests/test_engine.py
+++ b/services/backtester/tests/test_engine.py
@@ -1,13 +1,13 @@
 """Tests for the BacktestEngine."""
+
 from datetime import datetime, timezone
 from decimal import Decimal
 from unittest.mock import MagicMock
 
-import pytest
 
 from shared.models import Candle, Signal, OrderSide
 
-from backtester.engine import BacktestEngine, BacktestResult
+from backtester.engine import BacktestEngine
 
 
 def make_candle(symbol: str, price: float, timeframe: str = "1h") -> Candle: