Fix lint: move imports before pytestmark in test_streamer.py

tests/test_streamer.py

@@ -12,8 +12,6 @@ from unittest.mock import AsyncMock, Mock, patch
 
 import pytest
 
-pytestmark = pytest.mark.skip(reason="Async WebSocket tests have timing issues - streamer verified manually")
-
 from tradefinder.core.config import Settings
 from tradefinder.data.streamer import (
     DataStreamer,
@@ -21,6 +19,8 @@ from tradefinder.data.streamer import (
     MarkPriceMessage,
 )
 
+pytestmark = pytest.mark.skip(reason="Async WebSocket tests have timing issues - streamer verified manually")
+
 
 @pytest.fixture
 def settings() -> Settings: