Seeded demo accounts

• khamla@sahai.example — Sahai (restaurant + product)
• lin@wanderlust.example — Wanderlust Stays (hotel)
• mei@hq.example — Headquarters (nightclub)
• team@kazara.co — Kazara admin (all clients)

Password for all: demo1234. Created by yarn seed:supabase. Rotate before real use. Each client portal shows different bottom-of-funnel metrics based on its vertical.