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, 1 deletions

diff --git a/shared/tests/test_metrics.py b/shared/tests/test_metrics.py
index 079f01c..3fd72a7 100644
--- a/shared/tests/test_metrics.py
+++ b/shared/tests/test_metrics.py
@@ -1,10 +1,11 @@
 """Tests for Prometheus metrics utilities."""
-import pytest
+
 from prometheus_client import CollectorRegistry
 
 
 def make_metrics(service_name="test-service", registry=None):
     from shared.metrics import ServiceMetrics
+
     return ServiceMetrics(service_name, registry=registry)