Add comprehensive plant trading marketplace with:
- Prisma schema with marketplace models (Listing, Offer, SellerProfile, WishlistItem)
- Service layer for listings, offers, search, and matching
- API endpoints for CRUD operations, search, and recommendations
- Marketplace pages: home, listing detail, create, my-listings, my-offers
- Reusable UI components: ListingCard, ListingGrid, OfferForm, SearchFilters, etc.
Features:
- Browse and search listings by category, price, tags
- Create and manage listings (draft, active, sold, cancelled)
- Make and manage offers on listings
- Seller and buyer views with statistics
- Featured and recommended listings
- In-memory store (ready for database migration via Agent 2)
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