Route Layer-2 identification through Vercel AI Gateway (AI_GATEWAY_API_KEY,
default google/gemini-2.5-flash-lite). Add Layer-1 browser Tesseract name-strip
OCR with pg_trgm fuzzy catalog match via /api/cards/identify-by-text before
escalating to vision.
Co-authored-by: Cursor <cursoragent@cursor.com>
