Make metrics import optional to drop pytorch_fid requirement for UI

runners/base_runner.py

@@ -10,7 +10,11 @@ from pathlib import Path
 from editings.latent_editor import LatentEditor
 
 from models.methods import methods_registry
-from metrics.metrics import metrics_registry
+# Metrics are not needed for inference UI; make optional to avoid import errors
+try:
+    from metrics.metrics import metrics_registry
+except Exception:
+    metrics_registry = {}
 from utils.model_utils import get_stylespace_from_w