fix: use HunYuanVL processor types for native vLLM compatibility

preprocessor_config.json

@@ -15,6 +15,11 @@
     0.26130258,
     0.27577711
   ],
-  "image_processor_type": "BrainOCRImageProcessor",
-  "processor_class": "BrainOCRProcessor"
+  "image_processor_type": "HunYuanVLImageProcessor",
+  "processor_class": "HunYuanVLProcessor",
+  "do_convert_rgb": true,
+  "do_normalize": true,
+  "do_rescale": true,
+  "do_resize": true,
+  "rescale_factor": 0.00392156862745098
 }