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- Add internal/locale package: Parse(Accept-Language), FromContext/WithLang helpers, 12 supported languages - Add Language middleware that reads Accept-Language header and stores lang in context - Register Language middleware globally in server router (after CORS) Database migrations: - 009: create recipe_translations, saved_recipe_translations, ingredient_translations tables; migrate existing _ru data - 010: drop legacy _ru columns (title_ru, description_ru, canonical_name_ru); update FTS index Models: remove all _ru fields (TitleRu, DescriptionRu, NameRu, UnitRu, CanonicalNameRu) Repositories: - recipe: Upsert drops _ru params; GetByID does LEFT JOIN COALESCE on recipe_translations; ListMissingTranslation(lang); UpsertTranslation - ingredient: same pattern with ingredient_translations; Search now queries translated names/aliases - savedrecipe: List/GetByID LEFT JOIN COALESCE on saved_recipe_translations; UpsertTranslation Gemini: - RecipeRequest/MenuRequest gain Lang field - buildRecipePrompt rewritten in English with target-language content instruction; image_query always in English - GenerateMenu propagates Lang to GenerateRecipes Handlers: - recommendation/menu: pass locale.FromContext(ctx) as Lang - recognition: saveClassification stores Russian translation via UpsertTranslation instead of _ru column Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>