cleanup and rename provider to plugin

plugins/matrix/__init__.py

@@ -11,8 +11,8 @@ from urllib.parse import quote
 from API.requests_client import get_requests_session
 from SYS.utils import ffprobe as probe_media_metadata
 
-from ProviderCore.base import Provider, SearchResult
-from SYS.provider_helpers import TableProviderMixin
+from PluginCore.base import Provider, SearchResult
+from SYS.plugin_helpers import TablePluginMixin
 from SYS.logger import log
 
 _MATRIX_INIT_CHECK_CACHE: Dict[str,
@@ -276,7 +276,7 @@ def _matrix_health_check(*,
         return False, str(exc)
 
 
-class Matrix(TableProviderMixin, Provider):
+class Matrix(TablePluginMixin, Provider):
     """Matrix (Element) room provider with file uploads and selection.
     
     This provider uses the new table system (strict ResultTable adapter pattern) for