[CustomOp] Register AscendSharedFusedMoE custom op (#2980)

### What this PR does / why we need it?
Register `AscendSharedFusedMoE` custom op.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

`DeepSeek-V2-Lite` is a MoE model with shared experts.

Test:

```bash
vllm serve /root/.cache/modelscope/hub/models/deepseek-ai/DeepSeek-V2-Lite \
--trust-remote-code \
--enforce-eager \
--no-enable-prefix-caching \
--gpu-memory-utilization 0.95

curl -X POST http://localhost:8000/v1/chat/completions \
    -H "Content-Type: application/json" \
    -d '{
        "model": "/root/.cache/modelscope/hub/models/deepseek-ai/DeepSeek-V2-Lite",
        "messages": [
            {"role": "user", "content": "介绍一下联通公司？"}
        ],
        "stream": false,
        "max_tokens": 100
    }'
```

Output:

```bash
中国联合网络通信集团有限公司（简称“中国联通”）于2009年1月6日在原中国网通和原中国联通的基础上合并组建而成，在国内31个省（自治区、直辖市）和境外多个国家和地区设有分支机构，是中国唯一一家在纽约、香港、上海三地同时上市的电信运营企业，连续多年入选“世界500强企业”。\n\n中国联通主要经营固定通信业务，移动通信业务，国内
```


- vLLM version: v0.10.2
- vLLM main:
486c5599e3

---------

Signed-off-by: Shanshan Shen <87969357+shen-shanshan@users.noreply.github.com>
Signed-off-by: shen-shanshan <467638484@qq.com>

vllm_ascend/patch/worker/patch_common/__init__.py

@@ -18,4 +18,3 @@
 import vllm_ascend.patch.worker.patch_common.patch_distributed  # noqa
 import vllm_ascend.patch.worker.patch_common.patch_logits  # noqa
 import vllm_ascend.patch.worker.patch_common.patch_minicpm  # noqa
-import vllm_ascend.patch.worker.patch_common.patch_shared_fused_moe  # noqa

vllm_ascend/patch/worker/patch_common/patch_shared_fused_moe.py

@@ -1,21 +0,0 @@
-# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
-# Copyright 2023 The vLLM team.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-from vllm.model_executor.models import deepseek_v2, llama4
-
-from vllm_ascend.ops.common_fused_moe import AscendSharedFusedMoE
-
-deepseek_v2.SharedFusedMoE = AscendSharedFusedMoE
-llama4.SharedFusedMoE = AscendSharedFusedMoE