style: fix code formatting with black, isort, and flake8

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_rate_limiting.py

@@ -101,9 +101,10 @@ def test_rate_limit_exceeded_returns_429(client):
 @pytest.mark.security
 def test_rate_limiting_uses_correct_identifier():
     """Test that rate limiting uses IP or user ID as identifier."""
-    from app.middleware.rate_limit import get_identifier
     from fastapi import Request
 
+    from app.middleware.rate_limit import get_identifier
+
     # Create a mock request
     class MockRequest:
         def __init__(self):
@@ -157,9 +158,10 @@ def test_limiter_disabled():
 @pytest.mark.integration
 def test_rate_limit_exception_handler_registered():
     """Test that rate limit exception handler is registered."""
-    from app.main import app
     from slowapi.errors import RateLimitExceeded
 
+    from app.main import app
+
     # Verify exception handler is registered
     assert RateLimitExceeded in app.exception_handlers