invert zerogpu flag

app.py

@@ -70,7 +70,8 @@ print(f"Added {code_source_path} to sys.path")
 # --- End Repo Setup ---
 
 # --- ZeroGPU Setup ---
-ENABLE_ZEROGPU = os.environ.get("ENABLE_ZEROGPU", "false").lower() in ("true", "1", "t")
+DISABLE_ZEROGPU = os.environ.get("DISABLE_ZEROGPU", "false").lower() in ("true", "1", "t")
+ENABLE_ZEROGPU = not DISABLE_ZEROGPU
 print(f"ZeroGPU Enabled: {ENABLE_ZEROGPU}")
 # --- End ZeroGPU Setup ---