[Core][Diffusion] Refactor prompt updates into a modality-ready interaction framework (#6294)

Signed-off-by: Huang, Zeyu <11222265+fhfuih@users.noreply.github.com>

vllm_omni/diffusion/worker/input_batch.py

@@ -17,7 +17,7 @@ from dataclasses import dataclass, field
 import numpy as np
 import torch
 
-from vllm_omni.diffusion.prompt_update import prompt_update_versions
+from vllm_omni.diffusion.interaction.modality_handlers.prompt import prompt_update_versions
 from vllm_omni.diffusion.worker.utils import StepRequestState