chore: use Oxc formatter in VS Code

[concertypin]

Summary

• set all existing VS Code formatter settings to oxc.oxc-vscode
• remove the Prettier extension recommendation and obsolete Prettier setting
• retain existing language selectors and tab sizes

Validation

• pnpm run check && pnpm run build

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: ee38445e4f

ℹ️ About Codex in GitHub

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