merge annotate /ANNOTATE/core into /core.

fix chart updates

test_infinite_scroll_backend.py

@@ -8,7 +8,8 @@ sys.path.insert(0, str(Path(__file__).parent))
 
 from datetime import datetime, timedelta
 from core.data_provider import DataProvider
-from ANNOTATE.core.data_loader import HistoricalDataLoader
+# from ANNOTATE.core.data_loader import HistoricalDataLoader  # DEPRECATED - using main DataProvider
+from core.data_provider import DataProvider
 
 def test_backend_data_loading():
     """Test if backend can load historical data with direction parameter"""