byoc: add creating byoc instance and select byoc plan

[wildpcww]

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[gemini-code-assist]

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This pull request introduces documentation for the new TiDB Cloud BYOC (Bring Your Own Cloud) plan, including a new guide on how to create a BYOC instance and updates to existing documents on managing projects and selecting cluster tiers. The feedback focuses on aligning the new content with the repository's style guide, specifically correcting heading capitalization to sentence case and rephrasing multiple passive voice constructions to active voice using the second person ('you').

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• 2026-07-20 07:51:56.070895133 +0000 UTC m=+1218502.106990179: ☑️ agreed by lilin90.

[lilin90]

/approve

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