* i18n: add Russian (ru) interface translation
- Add ru.tsv catalog (~1950 entries, clean-room translations following PhotoCraft terminology: Слой, Образцы, Обработка контуров, Монтажная область, Обводка, Заливка)
- Register ru in LANGUAGES with plural_russian (one/few/many with 11-14 exception)
- Add Russian tests: registration, command/catalogue coverage, UI literals, history/diagnostics, plural forms
- Add ATTRIBUTION.toml entry for ru.tsv
- Update docs/localization.md, ROADMAP.md with Russian language
- All i18n tests pass, cargo fmt and clippy clean
* ru: translate labels added on main since the catalog was written; Russian in the Latin-font coverage test
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* ru: '>' in the JavaScript-off hint, as the other catalogs (Inter has no ▸)
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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