add multi user implementation and API updates

[HiddifyApp]

The system is now production-ready with a complete multi-user foundation for future enterprise features like resource scoping, API keys, and SSO integration! 🚀

[f2c-ci-robot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[HiddifyApp]

@wanghe-fit2cloud please review 🙏

[wanghe-fit2cloud]

Thank you for your contribution. We plan to provide user management functionality in a future release, so we will not merge this PR for now and will close it first.