chore(i18n): remove unused config helpers

[KooshaPari]

Summary

• remove unused i18n config helper exports that Knip reports as dead code
• reduce the dead-code ratchet total from 341 to 339 without changing runtime locale config exports

Validation

• npx prettier --write src/i18n/config.ts
• npx eslint src/i18n/config.ts --quiet
• node node_modules/knip/bin/knip.js --reporter json --no-progress --no-exit-code > C:\Users\koosh\OmniRoute-upstream.git\knip-quality-after.json
  • DEAD_EXPORTS=240
  • DEAD_FILES=99
  • DEAD_TOTAL=339

[gemini-code-assist]

Code Review

This pull request simplifies src/i18n/config.ts by removing the unused convenience helpers DOCS_TARGET_LOCALES and getLanguage. There are no review comments, so I have no feedback to provide.

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