### 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>