Missing multisig escrow support: arbiter_address field not passed to CoinPayPortal API

[Aiden181]

Bug Description

The ugig.net escrow integration with CoinPayPortal only supports the Custodial escrow model. CoinPayPortal supports a 2-of-3 Multisig escrow model that requires an arbiter_address field for dispute resolution, but this field is not accepted or passed through in the current codebase.

Impact

Users cannot create multisig escrows with an arbiter for dispute resolution. This limits ugig.net to custodial escrow only, which means there is no neutral third-party (arbiter) that can resolve disputes between depositors and beneficiaries.

Affected Files

1. src/lib/coinpayportal.ts — CreateEscrowOptions interface and createEscrow() function body do not include an arbiter_address field
2. src/app/api/gigs/[id]/escrow/route.ts — Zod validation schema, request destructuring, createEscrow() call, and database insert all lack arbiter_address support

Expected Behavior

• The API should accept an optional arbiter_address field (a wallet address for the dispute arbiter)
• This field should be passed through to the CoinPayPortal /api/escrow endpoint
• It should be stored in the gig_escrows table alongside the escrow record

Notes

• A fix for this issue is available in PR #___ (will be created alongside this issue)
• There is also a PATCH→PUT bug in skill.md (lines 144, 175) — PR fix(skill.md): change PATCH to PUT for gigs and posts update routes #254 by forgou37 addresses that