refactor(web): remove unused type alias VoiceLanguageKey

[fghpdf]

Summary

Remove unused type alias VoiceLanguageKey and its unused import I18nKeysWithPrefix from param-config-content.tsx.

Why

• The type alias VoiceLanguageKey was declared but never used
• Detected by npx oxlint
• Clean up codebase by removing unused code

Test plan

• pnpm lint:fix passes
• pnpm type-check:tsgo passes
• All 9449 frontend tests pass

Part of #25189

[gemini-code-assist]

Summary of Changes

Hello @fghpdf, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the web application by removing an unused type alias, VoiceLanguageKey, and its corresponding import, I18nKeysWithPrefix, from the param-config-content.tsx file. This targeted cleanup improves code hygiene and reduces unnecessary declarations, ensuring the codebase remains efficient and easier to maintain without introducing any functional changes.

Highlights

• Unused Type Alias Removal: The VoiceLanguageKey type alias, which was declared but never utilized, has been successfully removed from param-config-content.tsx.
• Unused Import Cleanup: The I18nKeysWithPrefix import, solely used by the now-removed VoiceLanguageKey, has also been eliminated, further streamlining the file.
• Codebase Hygiene: This change contributes to overall codebase cleanliness and maintainability by removing dead code, as identified by npx oxlint.

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[gemini-code-assist]

Code Review

This pull request correctly removes the unused type alias VoiceLanguageKey and its corresponding import from param-config-content.tsx. This change improves code clarity and maintainability by eliminating dead code. The refactoring is straightforward and has been implemented correctly. No issues were found.

[Copilot]

Pull request overview

This PR removes the unused type alias VoiceLanguageKey and its unused import I18nKeysWithPrefix from the text-to-speech parameter configuration component. The cleanup was identified by oxlint and improves code maintainability by removing dead code.

Key Changes

• Removed unused type import I18nKeysWithPrefix from @/types/i18n
• Removed unused type alias VoiceLanguageKey definition

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