add Zvec results

[egolearner]

Hello VectorDBBench maintainers,

This PR submitted the benchmark results of https://github.com/alibaba/zvec .

For reproduction guide see https://zvec.org/en/docs/benchmarks/.

Thanks

[sre-ci-robot]

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[egolearner]

Hi @XuanYang-cn, please take a look

[XuanYang-cn]

Hi @egolearner, thanks for your interest in VectorDBBench and for taking the time to submit benchmark results for Zvec!

However, we don't accept benchmark result PRs from external contributors. To ensure fairness and consistency across all
results, all benchmark results published in VDBBench must be tested and verified by our team using our own infrastructure and testing process.

We appreciate your contribution of the Zvec client support (#692). We may run the benchmarks on our side when the time comes.
Thanks again for your understanding!