feat: i18n — translate all hardcoded Italian strings (nutrition, facts, kiosk, gemini, scanner, shopping)
- Added 106 new translation keys across all 3 languages (it/en/de):
- nutrition.* (11 keys): card title, score labels, health/variety/fresh bars, source
- facts.* (70 keys): screensaver facts — greetings, expiry, shopping, categories, tips
- kiosk.* (12 keys): update check, install flow, exit/refresh button titles
- update.* (2 keys): badge label and button
- gemini.* (2 keys): chat button title, not-configured tooltip
- dashboard.banner_explain_title/btn/analyzing (3 keys): anomaly explain button
- add.history_badge_tip (1 key): history badge tooltip
- shopping.smart_last_update, names_already_updated (2 keys)
- appliances.empty (1 key)
- scanner.save_new_btn (1 key)
- app.js: replaced all remaining hardcoded Italian strings with t() calls
- api/index.php: fixed Frutta/Früchte Bring! loop (Pass 2 genericQualifiers)
- index.html: asset version bumped to v=20260511b
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