[Bugfix][Diffusion] Register Sana I2V pipeline as video output (#6953)

Signed-off-by: wangyu <410167048@qq.com>

tests/entrypoints/openai_api/test_video_pipeline_capability.py

@@ -64,3 +64,14 @@ def test_video_pipeline_rejects_non_video_final_outputs(stage_configs):
 )
 def test_registered_video_aliases_declare_video_output(model_class_name):
     assert get_diffusion_output_type(model_class_name) == "video"
+
+
+@pytest.mark.parametrize(
+    "model_class_name",
+    [
+        "SanaVideoPipeline",
+        "SanaImageToVideoPipeline",
+    ],
+)
+def test_sana_video_pipelines_declare_video_output(model_class_name):
+    assert get_diffusion_output_type(model_class_name) == "video"

vllm_omni/diffusion/model_metadata.py

@@ -88,6 +88,7 @@ _DIFFUSION_MODEL_METADATA: dict[str, DiffusionModelMetadata] = {
     "Cosmos3OmniDiffusersPipeline": DiffusionModelMetadata(final_output_type="video"),
     "Cosmos3OmniPipeline": DiffusionModelMetadata(final_output_type="video"),
     "SanaVideoPipeline": DiffusionModelMetadata(final_output_type="video"),
+    "SanaImageToVideoPipeline": DiffusionModelMetadata(final_output_type="video"),
     "SanaWmPipeline": DiffusionModelMetadata(
         supports_multimodal_inputs=True,
         max_multimodal_image_inputs=1,