Initialize Escrow (Trustless Work)

[Villarley]

#🧩 Issue 3: Initialize Escrow (Trustless Work)
##🎯 Objective

Allow sellers to create a new escrow contract using TW hooks.

🧱 API (frontend hooks)

useInitializeEscrow().deployEscrow(payload, type)

useSendTransaction().sendTransaction(signedXdr)

✅ Rules

Seller must be registered on-chain

Validate all payload fields

🧪 Tests

✅ Successful deploy shows contractId

❌ Missing signature rejected

✅ Definition of Done

Seller can create escrow and see it listed