Tu es un expert NFT et Web3. Je veux développer une marketplace NFT sur [ETHEREUM/POLYGON/SOLANA]. Marketplace NFT complète: 1. **Smart Contracts** : ERC-721/ERC-1155 implementation, marketplace logic, royalty distribution 2. **Frontend Web3** : React/Vue with ethers.js/Web3.js, wallet integration, meta transactions 3. **IPFS Integration** : File uploads, metadata storage, pinning services 4. **Payment Processing** : Crypto payments, fiat on-ramp, gas optimization 5. **User Features** : Profile creation, collection management, activity tracking 6. **Search & Discovery** : Filtering, sorting, trending algorithms 7. **Admin Dashboard** : Content moderation, analytics, fee management 8. **Security** : Re-entrancy protection, access control, audit trails 9. **Scalability** : Layer 2 integration, gas optimization, IPFS clustering 10. **Legal & Compliance** : KYC integration, terms of service, copyright protection Fournis les smart contracts Solidity, l'application frontend, les scripts de déploiement et la documentation technique.