Move multimodal processors into a separate folder (#7581)

python/sglang/srt/managers/io_struct.py

@@ -22,7 +22,7 @@ from dataclasses import dataclass, field
 from enum import Enum
 from typing import TYPE_CHECKING, Any, Dict, List, Optional, Union
 
-from sglang.srt.mm_utils import has_valid_data
+from sglang.srt.multimodal.mm_utils import has_valid_data
 
 # handle serialization of Image for pydantic
 if TYPE_CHECKING: