[diffusion] fix: fix diffusers executor crash when component residency manager is absent (#24573)

python/sglang/multimodal_gen/runtime/pipelines/diffusers_pipeline.py

@@ -20,6 +20,10 @@ from PIL import Image
 
 from sglang.multimodal_gen.configs.pipeline_configs.base import PipelineConfig
 from sglang.multimodal_gen.runtime.distributed import get_local_torch_device
+from sglang.multimodal_gen.runtime.managers.component_manager import (
+    ComponentResidencyStrategy,
+    get_global_component_residency_manager,
+)
 from sglang.multimodal_gen.runtime.models.vision_utils import (
     load_image as load_vision_image,
 )
@@ -371,6 +375,8 @@ class DiffusersPipeline(ComposedPipelineBase):
         self._stage_name_mapping: dict[str, PipelineStage] = {}
         self.modules: dict[str, Any] = {}
         self.memory_usages: dict[str, float] = {}
+        self.component_residency_strategies: dict[str, ComponentResidencyStrategy] = {}
+        self.component_residency_manager = None
         self.post_init_called = False
         self.executor = executor or SyncExecutor(server_args=server_args)
         self._cache_dit_enabled = False
@@ -726,7 +732,13 @@ class DiffusersPipeline(ComposedPipelineBase):
         """Execute the pipeline on the given batch."""
         if not self.post_init_called:
             self.post_init()
-        return self.executor.execute(self.stages, batch, server_args)
+
+        self.component_residency_manager = get_global_component_residency_manager(
+            self, server_args
+        )
+        self.executor.component_residency_manager = self.component_residency_manager
+
+        return self.executor.execute_with_profiling(self.stages, batch, server_args)
 
     @classmethod
     def from_pretrained(