Fix: Comment out PVB Film examples until images are added

The app was crashing because example images don't exist yet.
PVB Film model is still available in the dropdown, just without
pre-loaded example images for now.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

app.py

@@ -873,10 +873,10 @@ EXAMPLES = [
     ["examples/tire-cord-1.jpg", "Tire Cord", 0.25],
     ["examples/tire-cord-2.jpg", "Tire Cord", 0.25],
     ["examples/tire-cord-3.jpg", "Tire Cord", 0.25],
-    # PVB Film
-    ["examples/pvb-film-1.jpg", "PVB Film", 0.25],
-    ["examples/pvb-film-2.jpg", "PVB Film", 0.25],
-    ["examples/pvb-film-3.jpg", "PVB Film", 0.25],
+    # PVB Film - examples will be added once images are uploaded
+    # ["examples/pvb-film-1.jpg", "PVB Film", 0.25],
+    # ["examples/pvb-film-2.jpg", "PVB Film", 0.25],
+    # ["examples/pvb-film-3.jpg", "PVB Film", 0.25],
 ]
 
 # Model sessions cache