Added pagination support to:
- ListCompanies: filter by role, search
- ListProducts: filter by seller, search
- ListOrders: filter by buyer, seller, status
- ListInventory: filter by expiring date, seller
New domain types:
- ProductFilter, ProductPage
- CompanyFilter, CompanyPage
- OrderFilter, OrderPage
- InventoryPage
All endpoints now return paginated responses with:
- items array
- total count
- current page
- page size
Updated MockRepository in both test files to match new signatures
Backend:
- Extract 8 company handlers to company_handler.go (228 lines)
- handler.go reduced from 1254 to ~1026 lines
- Total refactoring: ~35% of original handler.go
READMEs updated:
- Backend: new architecture, test coverage table
- Marketplace: new pages (Orders, Inventory, Company, SellerDashboard), Vitest info
