[Refactor] refactor patch module (#3555)

### What this PR does / why we need it?
we notice that `patch_main` is never used. Usually the patch is for all
version. And if it's for specified version, we can use `vllm_version_is`
instead. So let's remove the useless sub folder in patch module to make
it clear.


- vLLM version: v0.11.0rc3
- vLLM main: https://github.com/vllm-project/vllm/commit/v0.11.0

Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>

vllm_ascend/patch/platform/__init__.py

@@ -14,5 +14,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from vllm_ascend.patch.platform import patch_common  # noqa: F401
-from vllm_ascend.patch.platform import patch_main  # noqa: F401
+import os
+
+import vllm_ascend.patch.platform.patch_config  # noqa
+import vllm_ascend.patch.platform.patch_distributed  # noqa
+import vllm_ascend.patch.platform.patch_mamba_config  # noqa
+
+if os.getenv("DYNAMIC_EPLB", False) or os.getenv("EXPERT_MAP_RECORD", False):
+    import vllm_ascend.patch.platform.patch_multiproc_executor  # noqa

vllm_ascend/patch/platform/patch_common/__init__.py

@@ -1,40 +0,0 @@
-#
-# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
-# This file is a part of the vllm-ascend project.
-#
-# 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.
-#
-import os
-
-from vllm.logger import logger
-
-import vllm_ascend.patch.platform.patch_common.patch_config  # noqa
-import vllm_ascend.patch.platform.patch_common.patch_distributed  # noqa
-import vllm_ascend.patch.platform.patch_common.patch_mamba_config  # noqa
-
-
-def patch_v1_executor():
-    try:
-        dynamic_eplb = os.getenv("DYNAMIC_EPLB", False) or os.getenv(
-            "EXPERT_MAP_RECORD", False)
-        if dynamic_eplb:
-            import vllm_ascend.patch.platform.patch_common.patch_multiproc_executor  # noqa
-        else:
-            logger.warning("Do not patch v1 executor.")
-    except RuntimeError as e:
-        logger.warning(
-            f"Fail to patch v1 executor, please add environment params DYNAMIC_EPLB or EXPERT_MAP_RECORD : {e}"
-        )
-
-
-patch_v1_executor()

vllm_ascend/patch/platform/patch_main/__init__.py

@@ -1,16 +0,0 @@
-#
-# Copyright (c) 2025 Huawei Technologies Co., Ltd. All Rights Reserved.
-# This file is a part of the vllm-ascend project.
-#
-# 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.
-#