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refactor: deduplicate checksum logic, rename GUNZILLA→ALTERNATE, update seaport-js (#1855)

* refactor: deduplicate protocol address checksum logic

- Pre-compute checksummed addresses in a Set for O(1) lookups
- Reuse requireValidProtocol in getSeaportInstance and getSeaportVersion
- Remove ~60 lines of duplicated checksum code

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* chore: update @opensea/seaport-js to 4.0.6

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* test: update getSeaportVersion error message expectations

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* refactor: rename GUNZILLA constants to ALTERNATE

Rename chain-specific protocol constants to be more generic since
they're used by multiple chains (Gunzilla, Somnia, etc.):
- GUNZILLA_SEAPORT_1_6_ADDRESS → ALTERNATE_SEAPORT_V1_6_ADDRESS
- GUNZILLA_CONDUIT_ADDRESS → ALTERNATE_CONDUIT_ADDRESS
- GUNZILLA_CONDUIT_KEY → ALTERNATE_CONDUIT_KEY
- GUNZILLA_FEE_RECIPIENT → ALTERNATE_FEE_RECIPIENT
- GUNZILLA_SIGNED_ZONE_V2_ADDRESS → ALTERNATE_SIGNED_ZONE_V2_ADDRESS

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

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