[Model] Optimize MiniMax-H3 DLO component lifecycle

Signed-off-by: hsliuustc0106 <liuhongsheng4@huawei.com>

vllm_omni/diffusion/offloader/__init__.py

@@ -17,7 +17,7 @@ from .distributed_layerwise_backend import (
     remove_distributed_block_hook,
 )
 from .layerwise_backend import LayerWiseOffloadBackend
-from .module_residency import PinnedModuleStager
+from .module_residency import BoundedAllocatorCache, PinnedModuleStager
 from .offload_plan import OffloadPlan, get_offload_plan
 from .sequential_backend import (
     ModelLevelOffloadBackend,
@@ -46,6 +46,7 @@ __all__ = [
     "DistributedLayerwiseOffloadBackend",
     "DistributedLayerwiseOffloadHook",
     "ModelLevelOffloadBackend",
+    "BoundedAllocatorCache",
     "PinnedModuleStager",
     "apply_sequential_offload",
     "remove_sequential_offload",