- Add 6-language support: original, de, en, it, fr, es
- Add quote metadata: source, year, tags, imageUrl, authorBio, verified
- Add originalLanguage field to preserve original quote language (la, el, zh, sa, etc.)
- Update all 50 quotes with full translations and metadata
- Add new utility functions: getQuoteText, getQuotesByTag, getAllTags,
getQuotesByAuthor, getVerifiedQuotes, getQuotesByYearRange,
getQuotesByOriginalLanguage
- Update matrix-zitare-bot to use new multilingual schema