fix: resolve email_inbound_token conflict in test fixtures

Merge PR #28: Fix ruff lint errors across codebase

tests/test_config.py

@@ -1,7 +1,5 @@
 """Tests for Settings config, specifically the database_url env var fallback."""
 
-import os
-
 from cartsnitch_api.config import Settings
 
 

tests/test_middleware/test_rate_limit.py

@@ -1,7 +1,7 @@
 """Tests for rate limiting middleware."""
 
 import time
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import AsyncMock, MagicMock
 
 import pytest