Add ENABLE_IP_ADAPTER config flag (default: False)

Allows disabling IP-Adapter FaceID entirely for cleaner output quality.
Set to True in config.py to re-enable face-locked generation.

worker/generator.py

@@ -244,7 +244,10 @@ class SDXLGenerator:
         logger.info(f"Parameters: {width}x{height}, steps={num_inference_steps}, guidance={guidance_scale}")
         
         # Check if face-locked generation requested
-        use_face_id = face_image is not None
+        use_face_id = face_image is not None and config.ENABLE_IP_ADAPTER
+        
+        if face_image is not None and not config.ENABLE_IP_ADAPTER:
+            logger.info("IP-Adapter disabled in config, generating without face lock")
         
         if use_face_id:
             # Initialize IP-Adapter if needed