Support Pangu Pro MoE model (vllm-project#1204)

### What this PR does / why we need it?
Support Pangu Pro MoE model (https://arxiv.org/abs/2505.21411)

### Does this PR introduce _any_ user-facing change?
Yes, new model supported

### How was this patch tested?
Test locally

---------

Signed-off-by: angazenn <zengyanjia@huawei.com>
Co-authored-by: angazenn <zengyanjia@huawei.com>

Author: Angazenn

vllm_ascend/models/__init__.py

@@ -47,3 +47,7 @@ def register_model():
     ModelRegistry.register_model(
         "Qwen3MoeForCausalLM",
         "vllm_ascend.models.qwen3_moe:CustomQwen3MoeForCausalLM")
+
+    ModelRegistry.register_model(
+        "PanguProMoEForCausalLM",
+        "vllm_ascend.models.pangu_moe:PanguProMoEForCausalLM")