fix: correct typos in comments and docs

[maxtaran2010]

Fix three spelling mistakes found via codespell:

• bucket.go line 398: add te sub-bucket -> add the sub-bucket
• db.go line 1298: explictly -> explicitly
• README.md line 1011: performent -> performant

All fixes are in comments and documentation only — no code logic or identifiers were changed.

[kubernetes-prow]

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[ahrtr]

Thanks for the PR. But listing AI tooling as a co-author, co-signing commits using an AI tool, or using the assisted-by, co-developed or similar commit trailer is not allowed. Please remove Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> and just update the description with info something like "This PR was written in part with the assistance of generative AI"

Refer to https://github.com/kubernetes/community/blob/main/contributors/guide/pull-requests.md#ai-guidance