Fix DiarizationService constructor compatibility

app/services/diarization_service.py

@@ -15,7 +15,14 @@ from app.models.transcript import DiarizationSpan
 
 
 class DiarizationService:
-    """Optional authenticated HTTP adapter for speaker diarization."""
+    """Optional authenticated HTTP adapter for speaker diarization.
+
+    Accept Settings for dependency-injection compatibility. Runtime options are
+    currently read from environment variables, matching the deployment contract.
+    """
+
+    def __init__(self, settings: Any = None) -> None:
+        self.settings = settings
 
     @property
     def url(self) -> str: