Two-sided service marketplace

Build a two-sided marketplace connecting local service providers (e.g. cleaners, tutors) with customers.

Core features:
1. Provider profiles with services, pricing, availability, reviews
2. Search + filter by category, location, rating
3. Booking flow with Stripe hold and payout on completion
4. Messaging thread between customer and provider
5. Admin moderation queue

Data: providers, services, bookings, reviews, messages.
Must-haves: RLS so users only see their own bookings/messages, notification emails.