Optimized the governing rules of the Volcano Community

[LiZhenCheng9527]

1、Optimized the governing rules of the Volcano sub-project.
2、Update Volcano 2026 Roadmap
3、Add a draft of Roadmap governance rule

[volcano-sh-bot]

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[gemini-code-assist]

Code Review

This pull request updates the GOVERNANCE.md file to clarify the governance rules for sub-projects, specifying that they can have their own repositories but must follow the main project's governance, and outlining the approval process for joining, archiving, or removing sub-projects. The review feedback suggests clarifying the phrase "Joining a subproject" to "Adding a subproject" to avoid ambiguity, and aligning the voting requirements with existing documentation by including both Owners and Maintainers and noting the "no negative votes" condition.

[hzxuzhonghu]

Otherwise LGTM

[LiZhenCheng9527]

@kevin-wangzefeng
@hzxuzhonghu
@william-wang
@JesseStutler
@k82cn
@Thor-wl
@shinytang6
@Monokaix

PTAL

[hzxuzhonghu]

+1