i18n: add Korean (ko) locale
Adds app/locales/ko.json with a natural Korean translation of all 25 UI strings, matching the exact key structure of en.json, and lists ko under the Built-in locales section of the README.
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Adds app/locales/ko.json with a natural Korean translation of all 25 UI strings, matching the exact key structure of en.json, and lists ko under the Built-in locales section of the README.