[Hardware] Support platforms and plugin system (#774)

Signed-off-by: gcanlin <canlinguosdu@gmail.com>

tests/e2e/offline_inference/test_diffusion_lora.py

@@ -9,7 +9,6 @@ from safetensors.torch import save_file
 
 from vllm_omni.inputs.data import OmniDiffusionSamplingParams
 from vllm_omni.outputs import OmniRequestOutput
-from vllm_omni.utils.platform_utils import is_npu
 
 # ruff: noqa: E402
 REPO_ROOT = Path(__file__).resolve().parents[2]
@@ -25,10 +24,6 @@ os.environ["VLLM_TEST_CLEAN_GPU_MEMORY"] = "1"
 # model to reduce runtime and avoid extra downloads.
 models = ["Tongyi-MAI/Z-Image-Turbo"]
 
-# NPU still can't run Tongyi-MAI/Z-Image-Turbo properly.
-if is_npu():
-    pytest.skip("Tongyi-MAI/Z-Image-Turbo is not supported on NPU yet.", allow_module_level=True)
-
 
 @pytest.mark.parametrize("model_name", models)
 def test_diffusion_model(model_name: str, tmp_path: Path):