Remove unused localization generator and tighten copy guards

[baixiangcpp]

Summary

• remove the unused synthetic localized content generator so future localized SEO copy is not produced through that shortcut
• fix localized copy issues found during a full JSON sweep, including fixture direct translations, German duplicate wording, Korean particle grammar, Japanese spacing, and Traditional Chinese spacing
• add a guard that scans all localized translation JSON and localized SEO template JSON for these known low-quality fragments

Verification

• npm test -- tests/guards/localized-copy-guard.test.ts
• npm run check:i18n
• npm run check:content-template && locale-specific content-template checks
• npm run check:content-template:quality && locale-specific quality checks
• npm run validate
• npm test
• npm run lint
• npm run build:app
• npm run build:post
• git diff --check

Localization review notes

• This does not use the removed synthetic generator.
• Full localized JSON coverage was checked across src/core/i18n/translations and src/core/seo/components/tool-content-template-modules/generated.
• Expected technical terms such as JWT, API, Base64, Base32, Base58, JSON, YAML, TOML remain as product/domain terms.

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