[feat] Extend disaggregated MiniMax-H3 stage with VAE encoders (#6939)

Signed-off-by: asukaqaq-s <1311722138@qq.com>
Signed-off-by: Jader <yjader@foxmail.com>
Co-authored-by: Jader <yjader@foxmail.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>

vllm_omni/diffusion/data.py

@@ -984,6 +984,7 @@ class OmniDiffusionConfig:
             "transformer": True,
             "vae": True,
             "text_encoder": True,
+            "vae_encoder": True,
         }
     )
     override_transformer_cls_name: str | None = None