[Diffusion] Address DLO host cache review feedback

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

vllm_omni/diffusion/model_loader/host_weight_cache.py

@@ -402,6 +402,9 @@ def _validate_entry(
         bindings=bindings,
         runtime_layout_key=cache_key,
         post_load_complete=True,
+        expected_file_digests={
+            str(entry_dir / filename): metadata["sha256"] for filename, metadata in file_manifest.items()
+        },
     )
 
 

vllm_omni/diffusion/model_loader/host_weight_plan.py

@@ -42,6 +42,7 @@ class HostWeightPlan:
     planned_source_prefixes: frozenset[str] = frozenset()
     runtime_layout_key: str | None = None
     post_load_complete: bool = False
+    expected_file_digests: dict[str, str] | None = None
 
 
 @dataclass(frozen=True)