Support swapping into ZEC

[Jon-edge]

CHANGELOG

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Dependencies

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Description

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Note

Enables ZEC swaps by preferring transparent receive addresses and adding a Zcash-specific send path that builds a ZIP-321 URI using shielded memo config; also removes ZEC from invalid destination list.

• Thorchain swap plugin (src/swap/defi/thorchain/thorchainCommon.ts):
  • ZEC support:
    • Prefer transparentAddress when receiving to zcash.
    • Add ZEC send flow: construct ZIP-321 URI (base64url memo), validate transparent vault thorAddress, use shielded_memo_config.unified_address as memo recipient, disallow ZEC tokens.
    • Pass zip321Uri via spendInfo.otherParams and send memo as text when applicable.
  • Inbound addresses handling:
    • Extend cleaner to parse shielded_memo_config and unified_address.
    • Fetch inbound_addresses to populate dust thresholds and map chain → shielded memo unified address.
  • Validation/config:
    • Remove zcash: ['ZEC'] from INVALID_CURRENCY_CODES.to (now {}), allowing ZEC as a destination.

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