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[Doc] Cherry-pick 0.18.0 release info (#8879) ### What this PR does / why we need it? This PR cherry-picks the release information for v0.18.0, including release notes, compatibility matrix updates, and documentation links. It also updates the maintenance status of older branches to reflect the new stable release. ### Does this PR introduce _any_ user-facing change? Yes, it updates the documentation and README files to reflect the new stable release v0.18.0. ### How was this patch tested? Documentation changes were verified for consistency across English and Chinese READMEs and the versioning policy. - vLLM main: https://github.com/vllm-project/vllm/commit/d886c26d4d4fef7d079696beb4ece1cfb4b008a8 Signed-off-by: wangxiyuan <wangxiyuan1007@gmail.com>23 天前